Burgers for a Bunch

Directions

1. In a large skillet, cook beef, onion, salt and pepper over medium heat until meat is no longer pink; drain. Stir in the potato flakes, egg, ketchup, relish and mustard; set aside.
2. For crust, melt 2 tablespoons butter in a small saucepan. Stir in 1/4 cup potato flakes; set aside.
3. In a bowl, combine the flour, sugar, cream of tartar and baking soda and remaining potato flakes. Cut in remaining butter; add milk and mayonnaise. Blend until a soft dough forms.
4. Divide in half. On a floured surface, roll one portion of dough into a 10-in. circle. Place in a 9-in. pie plate. Spread with meat filling; sprinkle with cheese. Roll out remaining dough and place on top of filling. Seal and flute edges. Brush with milk; sprinkle with reserved buttered potato mixture.
5. Bake at 375° for 20-25 minutes or until golden brown. Cut into wedges to serve.