Instructions: In a large skillet melt butter. Add onion; cover and cook 10 minutes or till tender. Spread onion in bottom of a 10x6x2 inch baking dish. Top with sliced eggs; sprinkle with shredded cheese. In a saucepan combine soup, milk, and mustard; heat and stir till smooth. Pour over casserole. Bake, covered, in a 350F oven for 30 minutes or till hot. Serve spooned over toasted bread. Sprinkle with paprika, if desired.

Makes 6 servings.

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