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Sauté onions, mushrooms, and bell pepper with salt and pepper in a medium-sized pan over Medium-Low heat
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Cook mushroom mixture until cooked through (onions will look transparent, and mushrooms will shrink down quite a bit)
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Once mushrooms are done, take out of pan and place on a plate to cool
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Add burgers to pan, and heat on one side for 5 minutes (or the amount of time designated on your frozen patties)
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Flip burgers and cook on other side for 3 minutes
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Cut burgers into slider-sized circles using a small round biscuit cutter (or spice jar top as I did); cut swiss cheese into same-sized circles and top burgers with cheese
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Finish cooking burgers for 1-2 minutes, until cheese melts
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To make vinaigrette, whisk all ingredients together in a small bowl or mason jar
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Drizzle vinaigrette over assembled salads of kale, tomatoes, shredded brussels sprouts, and dill pickles
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Finish each salad with 3 mini burger patties and sautéed mushrooms on top