Pepperoni Pizza Mac 'n Cheese Recipe

Ingredients

• 10 oz. dry penne pasta
• 1 pkg. sliced pepperoni (6 oz.)
• 2 Tbsp. olive oil
• 1 cup diced red bell peppers
• ½ cup diced onion
• 2 Tbsp. minced fresh garlic
• 1 Tbsp. dried oregano
• ½ tsp. red pepper flakes
• ⅓ cup all-purpose flour
• 3 ½ cups whole milk, warmed
• 9 oz. provolone cheese, shredded (about 3 cups), divided
• 6 oz. sharp white Cheddar, shredded (about 2 cups)
• 1 cup grated Parmesan, divided
• ½ cup sliced pimento-stuffed green olives, drained
• Salt and black pepper to taste
• 1 cup purchased marinara sauce