Step 1

Place a large, rimmed baking sheet (at least 17 x 11 inches) in oven; preheat to 425°F. (Do not remove while oven preheats.) Unwrap pizza dough, and cover with a kitchen towel. Let dough stand while oven preheats.

Step 2

Place a large, rimmed baking sheet (at least 17 x 11 inches) in oven; preheat to 425°F. (Do not remove while oven preheats.) Unwrap pizza dough, and cover with a kitchen towel. Let dough stand while oven preheats.

Step 3

Add mushrooms to hot drippings, and cook, stirring occasionally, until light golden, about 5 minutes. Add onions, and cook, stirring occasionally, until softened and beginning to brown, about 4 minutes. Remove mushrooms and onions with a slotted spoon, and drain on paper towels.

Step 4

Roll dough into a 17- x 11-inch rectangle. Remove preheated pan from oven, and carefully place the dough onto the pan.

Step 5

Bake in preheated oven just until dough is set, about 5 minutes. Remove from oven, and top with pizza sauce, beef, mushroom-onion mixture, shredded cheeses, and olives. Drizzle with ketchup.

Step 6

Return to oven, and bake until crust is golden and cheeses melt and begin to brown in places, about 15 minutes. Let stand 5 minutes before slicing.