Special equipment: a waffle maker
Preheat a waffle maker to a high heat according to the manufacturer's instructions.
To make 1 pizza, stretch or roll out one-quarter of the pizza dough to a size slightly smaller than the waffle maker. Spray the waffle maker with the olive oil spray and place the dough on the surface. Close the lid and cook until the dough is nicely browned, 2 1/2 to 3 minutes, depending on your machine.
Open the lid and spread a thin layer of marinara sauce across the pizza. Season with red pepper flakes and oregano. Sprinkle over a layer of mozzarella, sprinkle on some ham and pineapple chunks and top with roasted vegetables. Sprinkle over a second layer of mozzarella. Close the lid and cook just until the cheese melts, 1 to 2 minutes. Remove and eat. Careful, it will be hot!
Repeat with the remaining ingredients.