Baked Potatoes with milk

4 medium baking potatoes , baked 1 (6 ounce) can tuna , drained 2 tablespoons onions , minced 1 cup cheddar cheese , shredded 2 tablespoons butter 1/4[...]

4 lrg baking potatoes 1 Tbsp. butter 4 Tbsp. half-and-half 1 x egg yolk , beaten 1/4 tsp black pepper 1/2 c. Swiss cheese , grated     Onion Sauce 1/4 c.[...]