In a small bowl, combine 1½ tablespoons of the olive oil and ½ teaspoon of the garlic powder; set aside and reserve about 1 tablespoon of the mixture for later brushing.
Grease a bundt pan or a 9x13-inch baking dish with part of the oil mixture, and also lightly oil the inside of a large mixing bowl.
Lightly flour a work surface and roll the pizza dough into a 12 x 9-inch rectangle; using a knife or pizza cutter, cut the dough into 1-inch cubes.
Place the dough cubes in the greased mixing bowl. Add the shredded mozzarella, grated Parmesan, Italian seasoning, the remaining 1 teaspoon garlic powder, crushed red pepper flakes, a small pinch of salt, and up to 1 cup of your chosen pizza toppings.
Toss everything gently to distribute the cheese and toppings evenly among the dough cubes.
Transfer the mixture to the prepared pan and spread it evenly. Brush the reserved olive oil mixture over the top.
Cover the pan with a towel and let the dough rest for 15 to 20 minutes while you preheat the oven to 350°F (175°C).
Bake in the preheated oven until the bread is cooked through and golden brown: about 30–35 minutes for a bundt pan, or 15–20 minutes for a 9x13-inch baking dish. Check halfway through and tent with foil if the top is browning too quickly.
Remove from the oven and let cool in the pan for 5 minutes. If using a bundt pan, run a butter knife around the edges and invert onto a platter. Serve warm with marinara sauce.