Who knew a burger this good could be good for you too. The key? Blending mushrooms into the mix, which adds umami, moisture, and goes totally under the radar as far as flavor goes. A traditional bun gets swapped out for a whole grain Flatout Foldit, which adds just 90 calories a burger, along with a whopping dose of fiber. Best of all? Delicious.
Transfer the mushrooms to a bowl with the ground beef, the 1/2 teaspoon salt, and several grinds of black pepper. When cool enough to handle, use your hands to mix the mushrooms and meat evenly together. Try not to overwork the mixture. Form into 4 patties and season with a little more salt and pepper.