Preheat & Prep:

• Preheat the oven to broil on high.
• Lightly spray a 12-inch ovenproof skillet with cooking spray.

Cook the Burger:

• Press the ground beef into an even layer in the skillet.
• Use a spoon to create divots to prevent puffing.
• Season with salt, Italian seasoning, and black pepper.
• Broil for 15 minutes until cooked through and browned.
• Remove the burger from the skillet and set it aside. Discard the pan drippings.

Sauté the Onions & Garlic:

• Reduce the oven temperature to 450°F (230°C).
• Melt butter in the skillet over medium heat.
• Add onions and cook for 8 minutes, stirring occasionally.
• Stir in garlic and cook for 2 more minutes until fragrant.
• Transfer the sautéed onions and garlic to a plate.

Assemble the Pizza Burger:

• Place one pizza crust at the bottom of the skillet.
• Spread ¼ to ⅓ cup pizza sauce over the crust.
• Evenly distribute the onions and garlic.
• Place the cooked burger patty on top.
• Cover the burger with American cheese slices.
• Place the second pizza crust upside down over the burger.

Top & Bake:

• Spread the remaining pizza sauce over the top crust.
• Sprinkle with two-thirds of the mozzarella and Parmesan cheeses.
• Add pepperoni and mushrooms, distributing them evenly.
• Sprinkle with the remaining cheese.
• Bake for 20-25 minutes, until the cheese is melted and the crust is golden brown.

Slice & Serve:

• Cut into wedges and serve hot.
• Garnish with fresh basil and crushed red pepper flakes, if desired.