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1 prebaked 12-inch pizza crust
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1 can (8 ounces) pizza sauce
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1 teaspoon garlic powder
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1 teaspoon Italian seasoning
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1/4 cup grated Parmesan cheese
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1 small onion, halved and sliced
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12 frozen fully cooked homestyle meatballs (1/2 ounce each) , thawed and halved
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1 cup (4 ounces) shredded part-skim mozzarella cheese
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1 cup (4 ounces) shredded cheddar cheese
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