There are certain recipes that transcend mere sustenance, becoming a staple for busy mornings, a comforting presence during chaotic times, or simply a brilliant solution for feeding a crowd with ease. Joanne Chang’s baked egg sandwich, a signature offering from her renowned Boston bakery, Flour, is precisely one such recipe. This culinary gem isn’t just an egg sandwich; it’s a testament to intelligent kitchen design and the power of simple ingredients elevated to perfection.
For those unfamiliar, Joanne Chang is the visionary founder of Flour, a beloved bakery and cafe originating in Boston and now boasting nine successful locations. Among its many celebrated treats, Flour’s egg sandwich holds a special place in the hearts of its patrons. What sets it apart from conventional breakfast sandwiches, which typically rely on quickly fried or scrambled eggs, is Chang’s innovative approach: a pre-baked egg. This foundational component is crafted from a meticulously balanced mixture of beaten eggs and half-and-half, gently baked in a covered pan nestled within a water bath at a precise 300ºF (150ºC).
The Secret Behind the Unforgettable Custardy Texture
The brilliance of Chang’s method lies in the combination of a low baking temperature, the insulating water bath, and the richness of the half-and-half. These elements conspire to create an egg with an exceptionally delicate, custardy, and almost soufflé-like texture. This unique preparation not only results in an incredibly satisfying bite but also ensures that the egg reheats beautifully, maintaining its exquisite texture and flavor. This characteristic was a practical necessity for Chang; with limited space to cook eggs to order in a bustling bakery environment, the pre-baked egg allowed her to feature a high-quality egg sandwich on her menu, ready to be quickly assembled and served.
At Flour, the magic continues as the pre-baked egg is reheated to order, crowned with a slice of sharp cheddar cheese. It’s then served on a perfectly toasted focaccia roll, generously spread with dijonnaise – a tangy and creamy blend of mayonnaise and Dijon mustard. For an extra layer of indulgence, the sandwich often includes a slow-cooked tomato and crispy bacon. This harmonious blend of flavors and textures creates a truly spectacular combination that has earned Flour’s egg sandwich its legendary status.
Why This Baked Egg Recipe is a Game-Changer for Busy Mornings
The beauty of Joanne Chang’s egg sandwich extends far beyond the bakery walls. It’s not only incredibly easy to recreate at home but also incredibly convenient to incorporate into your own kitchen routine. Imagine having a stash of these perfectly baked egg squares ready to go. A quick, satisfying, and delicious meal can materialize in mere minutes, transforming chaotic mornings into culinary triumphs.
Many home cooks, myself included, aren’t natural meal preppers. While I might whip up salad dressings or sauces in large batches, dedicating entire weekends to preparing meals for the week ahead often feels like an insurmountable task. However, this baked egg recipe is different. It’s a manageable and highly rewarding form of meal preparation that yields significant returns. Over the years, I’ve returned to Joanne’s recipe time and again, particularly during periods of increased busyness or stress. Whether it was navigating a kitchen renovation, enduring the demands of hockey season, or preparing for a trip away from home, having these egg squares on hand provided an invaluable sense of ease and comfort, ensuring that nutritious and delicious meals were always within reach.
Another fantastic advantage of the pre-baked egg is its scalability, making it perfect for feeding a crowd. Hosting a brunch? Simply arrange the baked egg squares on a sheet pan, each topped with a slice of cheese, and place them in the oven alongside your choice of buns – brioche buns are an excellent choice for their rich, tender texture. Once the cheese is delightfully melty and the buns are lightly toasted, you can swiftly assemble and serve a spread of gourmet egg sandwiches that will impress every guest.
Mastering the Make-Ahead Marvel: Step-by-Step Guide to Joanne Chang’s Baked Eggs
Creating these exquisite baked eggs is a straightforward process that yields impressive results. Let’s walk through each step to ensure your success.
Ingredients for Your Culinary Journey
Before you begin, gather your essential ingredients:
- Fresh eggs
- Kosher salt (adjusting for type, as detailed in the recipe notes)
- Half-and-half or heavy cream
Crafting the Perfect Baked Eggs: A Detailed Process
- Start by whisking together the eggs and salt thoroughly in a large bowl. This ensures the salt is evenly distributed and the eggs are well combined before the dairy is introduced.
- Next, pour in the half-and-half (or heavy cream) and whisk again until everything is smoothly incorporated. The goal is a homogenous mixture, free of streaks.
- Prepare your baking dish: lightly butter an 8- or 9-inch square baking dish. This greasing prevents sticking and aids in easy removal once baked.
- Carefully transfer the egg mixture into the prepared baking dish.
- Now, for the critical step: the water bath. Place your smaller baking dish (containing the egg mixture) inside a larger 9×13-inch pan or similar oven-safe dish.
- Boil water separately – an electric tea kettle is ideal for this, typically holding around 4 cups. Pour the boiling water into the larger pan, allowing it to reach approximately 1/2 to 1 inch up the sides of the smaller egg dish. This water bath creates a gentle, even heat environment, preventing the eggs from overcooking and becoming rubbery, instead promoting that desirable custardy texture.
- With caution, transfer the entire setup (the larger pan with the water bath and the smaller pan with the eggs) to a preheated 300ºF (150ºC) oven. Crucially, cover the top of the smaller egg pan with a sheet pan. This cover helps to trap steam and prevents the top of the eggs from browning too quickly, contributing to the even, delicate cook.
- Place an egg rectangle on an oven-safe dish – individual sizzle pans work wonderfully for this. Lay a slice of cheese, such as cheddar, on top of the egg. Transfer this to a 350ºF (175ºC) oven for about 4 to 5 minutes, or until the cheese has beautifully melted and the egg is warmed through. A toaster oven is perfect for this task, allowing you to toast your brioche bun simultaneously. Keep a close eye on the brioche, as it tends to toast faster than the egg and cheese require. The heating time will vary depending on whether your egg pieces are refrigerated or at room temperature. For refrigerated eggs, I recommend heating them without cheese for 3-4 minutes, then adding the cheese slice and heating for another minute or so until melted. As an alternative, you can heat the egg-cheese combination in the microwave for 60 to 90 seconds.
- Toast your brioche bun to your desired level of golden perfection. This can be done in a conventional toaster, a toaster oven, or even under the broiler for a quick crisp.
- Author: Alexandra Stafford
- Total Time: 40 minutes
- Yield: 6 Sandwiches
- Diet: Vegetarian
- Shorter cooking time: I find 25-30 minutes (as opposed to 40 minutes) to be about right. Do rely on visual cues, however, as every oven is different.
- No pepper or thyme in the eggs (not because I don’t like them but because the recipe calls for adding them after 20 minutes of baking, which has always felt a little fussy).
- I cut the egg custard into 6 pieces as opposed to 4.
- 9 eggs
- 1 teaspoon (5 g) kosher salt, see note
- 3/4 cup half-and-half or heavy cream
- 1 slice cheese, I’ve been using Cheddar
- 1 egg rectangle, from the baked egg portion of the recipe
- 1 brioche roll, homemade or otherwise
- butter or other sauce of choice
- lettuce, optional
- oil and vinegar, optional, for the greens
- hot sauce, roasted red peppers, avocado, bacon, or any other additions you wish, for serving
- Preheat the oven to 300ºF (150ºC). Butter an 8- or 9-inch square baking dish. Bring a pot of water to a boil — I use my electric tea kettle, which holds about 4 cups.
- In a large bowl, whisk together the eggs and salt. Add the half-and-half and whisk to combine. Transfer the eggs to the prepared pan.
- Set the pan inside a 9×13-inch baking dish. Carefully pour the boiling water into the 9×13-inch baking dish, to reach 1/2- to 1-inch up the sides of the smaller pan. Carefully transfer the pan to the oven. Set a sheet pan on top of the pan to cover. Cook for 25-35 minutes (or potentially longer), but start checking after 25 minutes. To check for doneness, remove the sheet pan, and gently touch the egg custard — it should feel set. If it is not set, recover the pan and set the timer for 5 minutes more. My eggs consistently cook in 25 to 30 minutes.
- Carefully remove the egg custard from the water bath and set it on a cooling rack. Let rest for 10 minutes before cutting. Cut into 6 rectangles. Proceed with the recipe or transfer the rectangles to a storage vessel and store in the fridge for up to 1 week.
- Place the egg on an oven-safe dish — I like these sizzle pans — and lay a slice of cheese on top. Transfer to a 350ºF (175ºC) oven for 4 to 5 minutes or until the cheese has melted. I do this in my toaster oven and toast the brioche bun alongside — do keep an eye on the brioche bun, however, as it tends to toast before the egg/cheese piece is ready. Also, depending on if your eggs were refrigerated or not, this will take more or less time. If my egg pieces have been refrigerated, I’ll heat them without cheese in the toaster oven for 3 to 4 minutes, then I’ll top with a slice of cheese and heat for another 1 minute or so. (Alternatively: heat the egg-cheese combo in the microwave for 60 to 90 seconds.)
- Toast the brioche: you can do this in a toaster or an oven depending on what you prefer.
- Spread butter or sauce of choice over the toasted brioche. Top with an egg-and-cheese slice. Top with hot sauce, if using, and any other additions: greens (lightly dressed with oil and vinegar), roasted red peppers, avocado, etc.
- Prep Time: 10 minutes
- Cook Time: 30 minutes
- Category: Breakfast
- Method: Oven
- Cuisine: American
Bake for 25-35 minutes, though it’s wise to begin checking for doneness after 25 minutes. To assess if they’re ready, gently remove the top sheet pan and lightly touch the center of the egg custard. It should feel set and firm, with a slight jiggle. If it still appears liquid, recover and continue baking for another 5 minutes, checking again. Ovens vary, so visual cues are key. In my experience, these eggs typically reach perfection within 25 to 30 minutes.
Once set, carefully remove the egg custard from the water bath and place it on a cooling rack. Allow it to rest for at least 10 minutes before cutting. This resting period allows the custard to fully set and makes for cleaner cuts. Slice the baked egg into 6 roughly equal rectangles. At this point, you can proceed with assembling your sandwiches or transfer the cooled egg rectangles to an airtight storage container and refrigerate for up to one week, ready for quick meals throughout the week.
Assembling Your Dream Egg Sandwich
To create a truly irresistible egg sandwich, follow these steps:
Now, it’s time to assemble your personalized masterpiece. Spread butter or your sauce of choice (like dijonnaise) over the toasted brioche. Top with the warm, cheesy egg slice. From here, the possibilities are endless! Flour Bakery typically includes slow-cooked tomatoes and bacon, but you can customize it with your favorite garnishes. I personally adore the simplicity of fresh greens, lightly dressed with a touch of oil and vinegar, which adds a refreshing counterpoint to the rich egg and cheese. Other fantastic additions include hot sauce for a kick, roasted red peppers, creamy avocado slices, or crispy bacon. Let your palate be your guide!
A note on brioche: While making homemade brioche rolls from scratch is a rewarding endeavor when time permits, having a stash of good quality store-bought brioche buns in the freezer is a wonderful shortcut. Their tender texture and slight sweetness perfectly complement the savory egg, making these sandwiches exceptionally delightful.
Versatility and Storage: Enjoying Your Baked Eggs All Week Long
The true genius of Joanne Chang’s baked eggs lies in their incredible versatility and make-ahead potential. Once baked and cooled, the egg slices can be stored in an airtight container in the refrigerator for up to a week. This means you can prepare a batch on the weekend and enjoy gourmet-level egg sandwiches with minimal effort throughout your busy weekdays. Having these ready-to-use egg squares on hand truly simplifies meal planning and ensures you always have a wholesome and delicious option for breakfast, brunch, or even a light lunch.
These baked egg slices are also wonderful paired with various other ingredients beyond the classic Flour sandwich. Imagine them on homemade buns with sweet roasted red peppers and crisp pea shoots for a fresh, vibrant twist. Or try them in a breakfast burrito, chopped into a salad, or simply enjoyed on their own as a protein-rich snack. Their mild flavor and tender texture make them an excellent canvas for countless culinary creations.
Joanne Chang’s Egg Sandwich
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Average: 4.9 from 9 reviews
Description
From Joanne Chang’s cookbook Flour, Too.
Notes:
A few changes from the original recipe:
Salt: I always use Diamond Crystal kosher salt. If you are using Morton’s kosher salt or fine sea salt use half the amount by volume (1/2 teaspoon) or the same amount by weight (5 grams).