Derby Casserole - cooking recipe

Ingredients

1/2 c. chopped onion
2 Tbsp. butter or margarine
2 Tbsp. flour
1 1/4 c. milk
1 c. shredded sharp cheese
6 hard-cooked eggs, sliced
1 1/2 c. crushed potato chips
10 to 12 slices bacon, fried crisp and crumbled

Preparation

Cook onion in butter until tender, but not brown.
Blend in flour; add milk.
Cook, stirring constantly, until mixture thickens.
Add cheese.
Stir until melted.