Preheat oven to 375°F.

Spray the inside of a springform pan with cooking spray and lay in one of the Pizza doughs. Press the dough into the corners.

Sprinkle the olive oil, 2 cloves of the minced garlic, salt, and pepper on the dough and brush to cover the surface. Press the bottom of the dough with a fork.

Bake until the dough is cooked and lightly golden brown, 15 minutes.

Mix together the tomato puree, dried basil, 4 cloves of minced garlic, dried oregano, and tomato paste in a bowl. Season to taste with salt and pepper.

Into the partially cooked bottom layer of pizza dough, shingle a layer of mozzarella slices and then a layer of the homemade marinara sauce.

Spiral the meatballs in the dish as tightly as possible. Cover with more marinara sauce.

Add a layer of caramelized onions, and more sliced mozzarella.

Add sauteed bell peppers, top with 2nd pizza dough and vent top.

Brush with 2 Tbsp. more of Butter, 2 cloves minced garlic, and salt.

Bake for 40 minutes to an hour, or until the dough on top is browned and the sauce, meatballs, and cheese are heated through.