Hamburger Pizza - Pankobunny

Ingredients

• 600 g ground beef
• 1 onion
• 1 cup panko bread crumbs
• 2 eggs
• 2 tsp butter
• salt and pepper (a pinch)
• 2 tbsp vegetable oil
• pizza sauce
• 1 cup mozzarella cheese
• your desired toppings: mushrooms (corn, green pepper, olives, pepperoni, etc.)