Tuna Casserole

Ingredients:
1 can tuna, drained
8 ounces elbow macaroni
4 tbl butter
3 tbl finely chopped onion
2 tbl flour
3/4 tsp salt
1/8 tsp pepper
1 cup milk
1/2 cup frozen peas
1 can cream of mushroom soup
1 cup shredded cheddar cheese
cornflakes crushed

Directions:
Cook macaroni in boiling water, drain and rinse. Melt butter in a large saucepan, add chopped onion and saute until tender. Add flour, salt, and pepper, cook stiring until smooth and bubbly. Add milk and mushroom soup and stir over low heat until smooth and thickened. Add cooked macaroni, tuna, peas, and about half the cheese to sauce mixture. Pour the mixture into a casserole dish, buttered. Top with remaining cheese and sprinkle crushed cornflakes. Bake at 350 for 30-40 minutes or until browned.