Loaded Tuna Casserole

Ingredients

• 2 cups elbow macaroni
• 1 cup celery
• 1/2 cup onion, chopped
• 2 tablespoons butter or 2 tablespoons margarine
• 3/4 cup sour cream
• 3/4 cup mayonnaise
• 1 (1 ounce) packet chicken gravy mix
• 1/4 cup milk
• 2 (6 ounce) cans tuna, drained
• 1 tablespoon red pepper flakes, to taste
• 2 hard-boiled eggs, chopped and crumbled
• 3/4 cup peas, either canned or frozen
• 2 cups cheddar cheese