Corned Beef Hash Pie

1 pound corned beef hash

1 egg -- slightly beaten

1/2 cup catsup

1 pint peas or corn

1/4 pound american cheese -- grated

3 tablespoons milk

1/8 teaspoon dry mustard

Combine hash, egg, catsup. Mix. Line bottom and sides of greased 9 inch square pan with this mixture. Spread the vegetables in top. Put cheese, milk and mustard in saucepan. Heat until blended. Pour over meat-vegetable mixtue. Bake 350 oven for 20 minutes.