Creamy Seaside Casserole
["1 pkg. Velveeta shells and cheese", "1/4 c. chopped onion", "1/4 c. green pepper", "2 Tbsp. margarine", "1 (10 oz.) green peas, thawed and drained", "1 (6 1/2 oz.) tuna, drained and flaked", "1/2 c. mayonnaise"]
["Prepare shells and cheese as directed on package.", "Saute onions and pepper in margarine.", "Add to shells and cheese with remaining ingredients.", "Mix well.", "Spoon into 1 1/2-quart casserole; cover.", "Bake at 350\u00b0 for 30 minutes or until thoroughly heated."]
["Velveeta shells", "onion", "green pepper", "margarine", "green peas", "tuna", "mayonnaise"]