Baked Macaroni and Cheese

1 1/2 cup elbow macaroni
3 Tbspns. butter or margarine
1/4 cup onion, minced
3 Tbspns. flour
1 1/2 cup milk
1/2 tspn. salt
Dash of pepper
3cups grated chedar cheese
1/4 tspn. paprika

Cook macaroni in boiling salted water until tender. Drain. In a saucepan melt butter. Add onion, cook until soft. Blend in flour and milk. Cook and stir until thick. Add salt, pepper, paprika, and cheese. Heat and stir until cheese is melted. Mix sauce with macaroni. Pour into greased casserole dish and bake at 350 for 30 minutes or until bubbly and lightly browned.