3 tbsp. butter
2 c. sliced vidalia onions
1 (9 inch) deep dish pie shell
1/2 c. grated Swiss cheese
2 eggs
1 c. half and half
1/8 tsp. salt
1/2 tsp. dry mustard
1/8 tsp. cayenne pepper
2 to 3 tbsp. Parmesan cheese
1/8 tsp. paprika

Preheat oven to 400 degrees. Saute onions in butter until slightly limp. Place in pie shell; top with Swiss cheese. Combine next five ingredients and pour over the onions. Top with Parmesan and paprika. Bake at 400 degrees for 15 minutes; reduce heat to 325 degrees and bake an additional 20 to 25 minutes or until a knife inserted in the center comes out clean.