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Instructions

• STEP 1

  Preheat a large skillet over medium heat.

• STEP 2

  While the skillet heats up, peel, halve, and slice onions crosswise into thin half-moons.

  • 2 medium red onions

• STEP 3

  Once the skillet is hot, add oil and swirl to coat the bottom. Add onions and salt; reduce heat to medium-low and cook, stirring occasionally, until soft and golden, about 20 minutes.

  • 1 tbsp extra virgin olive oil
  • 1/2 tsp salt

• STEP 4

  Meanwhile, wash, dry, and mince mushrooms. Place in a medium bowl along with beef, bread crumbs, egg, Worcestershire, salt, and pepper. Mix with your hands until well combined, then form the mixture into 4 equal-sized patties. Place on a plate.

  • 1/2 lb cremini mushrooms
  • 1 1/2 lbs lean ground beef
  • 2/3 cup panko bread crumbs
  • 1 egg
  • 2 tsp worcestershire sauce
  • 3/4 tsp salt
  • 1/2 tsp black pepper

• STEP 5

  Preheat a grill pan, outdoor grill, or regular skillet over medium-high heat.

• STEP 6

  Once the pan is hot, add burger patties and cook, undisturbed, until golden underneath, about 5 minutes; flip patties, top with cheese, and cook an additional 5-6 minutes, until cooked through. Remove to a clean plate and loosely cover with aluminum foil.

  • 4 slices mozzarella cheese, sliced

• STEP 7

  Meanwhile, wash, dry, and thinly slice tomatoes. Place on another plate, then season with salt and pepper.

  • 2 tomatoes
  • 1/8 tsp salt
  • 1/8 tsp black pepper

• STEP 8

  When the onions are golden, add vinegar, sugar, and pepper to the skillet. Continue to cook, stirring often, until liquid has reduced, 2-3 minutes. Remove from heat.

  • 3 tbsp balsamic vinegar
  • 1 tsp brown sugar
  • 1/4 tsp black pepper

• STEP 9

  Toast buns on the pan, grill, or in a toaster (optional).

  • 4 whole grain buns or rolls

• STEP 10

  To assemble the burgers, spread the bottom half of each bun with mayo, then layer with a cheesy burger patty, tomato, and caramelized onions. Close with the top half of each bun.

  • 1/4 cup mayonnaise

• STEP 11

  To serve, divide burgers between plates and enjoy!