Preheat your grill or skillet over medium-high heat. Place the frozen pizza crusts on a baking sheet or plate for assembly.
Form four equal-sized burger patties from the ground beef, seasoning with salt and pepper. Shape them to be slightly larger than the pizza crusts to account for shrinkage. Place the patties onto the hot grill or skillet, cooking for about 4-5 minutes per side until browned and cooked through. Use a spatula to flip and monitor doneness visually, with juices running clear and a caramelized crust forming.
4 pieces frozen pizza crusts
While the burgers cook, lay the pizza crusts on a clean surface. Spread an even layer of pizza sauce on each crust, leaving a small border around the edges. Add sliced toppings if desired, then top each with a slice of cheddar cheese.
4 pieces frozen pizza crusts
Once the burger patties are cooked, place each directly onto a pizza crust. Top each with a generous sprinkle of shredded mozzarella cheese to melt during the final step.
4 pieces frozen pizza crusts
Transfer the assembled pizzas to the grill or return to the skillet. Cover loosely with aluminum foil or a lid to help melt the cheese and crisp the crust for about 3-4 minutes. Look for the cheese to be bubbly and golden brown.
Remove from heat, slice each pizza burger in half if desired, and serve hot. The final dish should feature a crispy crust, juicy burger, and gooey melted cheese with crispy edges.