01 - Preheat broiler or toaster oven to high heat setting.
02 - Arrange bread slices on a baking sheet and broil for 1 to 2 minutes per side, until lightly golden.
03 - Generously spread pizza sauce or marinara evenly over each toasted bread slice.
04 - Top each slice with shredded mozzarella and grated Parmesan, mounding cheese in the center for a molten effect.
05 - Distribute preferred toppings such as pepperoni, black olives, bell pepper, and mushrooms over cheese. Sprinkle with dried oregano and red pepper flakes if desired.
06 - Return to broiler and heat for 3 to 5 minutes, watching carefully, until cheese melts, bubbles, and starts to overflow the bread edges.
07 - Remove from oven and let cool for 1 to 2 minutes to set the cheese before serving.