INGREDIENTS
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1 (1-lb.) package ground mild Italian sausage
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2 garlic cloves, minced
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1 tablespoon olive oil
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1 (26-oz.) jar marinara sauce
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1 teaspoon kosher salt, divided
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1/2 medium-size red onion, chopped
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1/2 medium-size red bell pepper, chopped
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1/2 medium-size green bell pepper, chopped
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1/2 (8-oz.) package sliced baby portobello mushrooms
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1 cup sliced black olives
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1/2 cup pepperoni slices, chopped
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1 (16-oz.) package rigatoni pasta
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3 tablespoons butter
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3 tablespoons all-purpose flour
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3 cups half-and-half
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8 ounces fresh mozzarella, shredded (2 cups)
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1/2 cup grated Parmesan cheese
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1/2 teaspoon freshly ground black pepper
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1 (8-oz.) package shredded mozzarella cheese
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8 to 10 pepperoni slices