Macaroni Olive Gratin

Ingredients

• 1 cup elbow macaroni, uncooked
• 1/3 cup chopped green pepper
• 1/3 cup chopped celery
• 1/3 cup chopped onion
• 2 tablespoons olive oil
• 1 cup mayonnaise
• 1/2 cup (2 ounces) shredded Cheddar cheese
• 1 (8-ounce) carton sour cream
• 1 (4-ounce) can sliced mushrooms, drained
• 1 (4-ounce) can sliced ripe olives, drained
• 1 (4-ounce) jar diced pimiento, drained
• 1/4 teaspoon black pepper
• 1/8 teaspoon ground red pepper
• 1/4 cup Italian-seasoned breadcrumbs
• 2 tablespoons margarine, melted
• 1/4 teaspoon paprika