Golden Harvest Mushroom Burger

This delightful veggie burger recipe is a thoughtful combination of two highly acclaimed dishes: the “Stellar Quinoa Burgers” from Bon Appetit (inspired by Cafe Pasqual’s) and a “Quinoa and Sweet Potato Cakes” recipe originally from Cannelle et Vanille, as shared by Sally of Bewitching Kitchen. The goal was to harness the best of both worlds, resulting in a burger that is both flavorful and structurally sound.

For optimal convenience and efficiency during preparation, I highly recommend using a food processor equipped with a shredder attachment to grate both the sweet potatoes and the mushrooms. This method ensures uniform pieces, which contributes to an even cooking process and a consistent texture throughout the patties. If you do not have access to a food processor, fret not! When grating the sweet potato by hand with a box grater, you’ll find it significantly easier to handle if the sweet potato is kept whole rather than cut into wedges. For the mushrooms, a fine mince with a sharp knife will achieve similar results.

One of the many advantages of this recipe is its make-ahead potential. Once you’ve prepared the veggie burger mix, it can be stored in an airtight container in the refrigerator for up to 2-3 days. This makes it incredibly convenient for meal prepping. For a quick and healthy lunch or a light dinner on busy weeknights, simply form and broil or pan-fry 2 or 3 patties as needed. The flavors meld beautifully as the mixture rests.

Furthermore, these burgers hold up exceptionally well after being cooked. Feel free to cook a larger batch and store the finished patties in the fridge. I can personally attest to their deliciousness even when enjoyed cold, straight from the refrigerator. This versatility makes them a fantastic option for packed lunches, picnics, or simply as a ready-to-eat snack. Don’t hesitate to cook them in advance; their appeal only grows with time!

Enhance Your Burger Experience with Two Simple, Essential Condiments:

1. **Creamy Mashed Avocados:** Take 1-2 ripe avocados, mash them to your desired consistency, and season simply with a pinch of kosher salt and a generous squeeze of fresh lime juice. This adds a rich, creamy, and zesty counterpoint to the savory burgers.
2. **Quick-Pickled Onions:** Thinly slice a red onion and place the rings in a small bowl. Sprinkle liberally with your favorite vinegar (apple cider vinegar or white wine vinegar works wonderfully) and a pinch of salt. Let it stand for at least 15 minutes while you prepare the rest of your meal. The onions will soften slightly, lose their raw bite, and develop a delightful tangy flavor, adding a bright burst to your burger.

Ingredients

• 1/2 cup quinoa, rinsed thoroughly
• Kosher salt and freshly ground black pepper, to taste
• 1 tablespoon olive oil or grapeseed oil, plus extra for frying or brushing for broiling
• 1 shallot or small red onion, minced very finely (to yield about 1/3 cup)
• A generous pinch of red pepper flakes (optional, for a hint of warmth)
• 5 to 6 ounces cremini mushrooms (approximately 8 medium mushrooms), or 1 large portobello mushroom, roughly chopped
• 1 medium sweet potato, weighing about 11 oz, scrubbed clean but not peeled, cut into food processor-friendly wedges (see notes in description above for grating without a food processor)
• 1/2 cup panko bread crumbs (or regular bread crumbs)
• 1/2 cup finely minced fresh parsley or cilantro, packed
• 1/2 cup grated Parmigiano Reggiano cheese (or a suitable dairy-free alternative for a vegan option)
• 3 large eggs, lightly beaten (for binding; substitute with flax eggs for vegan)
• For serving (optional): high-quality burger buns (homemade brioche buns are highly recommended!), creamy mashed avocado, tangy quick-pickled onions, crisp lettuce or fresh sprouts (see notes in description above for simple condiment recipes)

Instructions

1. Cook the Quinoa: In a medium-sized saucepan, combine the rinsed quinoa with 1 cup of water. Add a small pinch of salt. Bring the mixture to a rolling boil over high heat, then immediately reduce the heat to low, cover the pot tightly, and allow it to simmer undisturbed until the quinoa is tender and all the water has been absorbed, which typically takes about 20 minutes. Once cooked, remove the pot from the heat but keep it covered for an additional 5-10 minutes. This allows the quinoa to steam further and become perfectly fluffy. You should yield approximately 1 1/2 cups of cooked quinoa.
2. Sauté the Aromatics: While the quinoa is cooking, place a large sauté pan or skillet over medium-high heat. Add 1 tablespoon of olive oil or grapeseed oil. Once the oil begins to shimmer, add the finely minced shallots or onion along with the optional pinch of red pepper flakes. Stir briefly, then cover the pan and reduce the heat to medium. Cook until the shallots or onion have softened and become translucent, which should take about 5 minutes. This step builds the foundational aromatic flavor for your burgers.
3. Prepare and Sauté Vegetables: While the shallots are softening, prepare your mushrooms and sweet potato. If using a food processor with a shredder attachment, feed the mushrooms down the chute first, followed by the sweet potato wedges. If shredding by hand, use a cheese grater for the unpeeled sweet potato (it’s easier when whole) and finely mince the mushrooms. Once prepared, add the shredded mushrooms and sweet potatoes to the pan with the sautéed shallots. Increase the heat back to medium-high and cook, stirring occasionally, until the vegetables are just tender and any excess moisture has evaporated, about 2 minutes more. Season the vegetables lightly with salt to taste. Transfer this savory vegetable mixture to a large mixing bowl. Add the cooked quinoa, panko bread crumbs, finely minced parsley (or cilantro), and grated Parmigiano Reggiano. Stir everything thoroughly to combine all the ingredients. Now is your crucial opportunity to taste the mixture and adjust the seasoning. If it needs more salt, pepper, or a bit more red pepper for warmth, add it now. Finally, pour in the beaten eggs and stir again until all ingredients are well incorporated and the mixture is cohesive.
4. Perform a Test Patty for Perfection: Before forming all your patties, it’s wise to make a test patty. Place a clean large skillet over high heat and add a thin layer of oil to coat the bottom. While the oil heats and shimmers, scoop out a small amount of the quinoa mix (about 2 tablespoons). Gently cup it in your hands to form a ball, then carefully flatten it into a small patty. Lower the test patty into the hot oil, season with a little salt and pepper, and cook for about 2 minutes, or until the underside develops a deep golden-brown crust. Flip it carefully and cook for another 2 minutes on the second side. Remove from the skillet and let it cool briefly. Taste the test patty. This is your chance to fine-tune the mixture. If the patty crumbles or falls apart easily, the mixture might be too dry; add a little more beaten egg (or a flax egg substitute). If it feels too wet or loose, add an extra tablespoon or two of panko bread crumbs to absorb moisture. Adjust seasoning with more salt and pepper if needed. This step ensures all your burgers turn out perfectly.
5. Form the Patties: Once your mix is perfectly seasoned and holds together, use a 1/3 to 1/2 cup measuring cup to portion out the mixture. Scoop a portion, gently squeeze it with your hands to compact it slightly, then form it into a ball, and finally flatten it into a patty. Remember, the mixture will be delicate and somewhat wet, so handle with care. Continue this process until all the mixture has been formed into uniform patties.
6. To Pan-Fry the Patties: Return the skillet (from the test patty step) to medium-high heat. Add more olive oil or grapeseed oil if necessary to create a thin layer across the bottom of the pan. Carefully lower the formed patties into the hot oil, ensuring not to overcrowd the pan (cook in batches if needed). Cook each patty for two to three minutes per side, or until a beautiful, golden-brown crust has formed. It’s crucial to resist the urge to peek or move the patties too soon; allowing them to cook undisturbed for the first minute or two helps them develop that desirable crispy exterior.
7. To Broil the Patties (My Preferred Method for Ease!): If you prefer a hands-off and often healthier cooking method, broiling is fantastic. Preheat your broiler to high heat. Line a sturdy baking sheet with aluminum foil for easy cleanup. Lightly brush the foil with olive oil to prevent sticking. Arrange the formed veggie patties on the oiled foil, leaving a little space between each. Lightly brush the tops of the patties with olive oil and season them with a sprinkle of sea salt. Place the sheet pan under the broiler for 3 to 5 minutes, keeping a very close eye on them, until the tops begin to lightly char and turn golden. There’s no need to flip them when broiling; cooking on one side is usually sufficient to heat them through and create a lovely crust.
8. Serve and Enjoy: Serve your freshly cooked (or broiled!) Sweet Potato and Mushroom Quinoa Veggie Burgers immediately. Place them on toasted burger buns (especially those wonderful brioche buns), generously topped with creamy mashed avocados, crisp lettuce or fresh sprouts, and those delightful tangy quick-pickled onions. A side of sweet potato fries or a fresh green salad would complete this wholesome and utterly satisfying meal.