Savory Meat Tarts

This is another quick and easy dish found in The "Art" of Cooking. What I especially like is I don't have to try to make a pastry crust.

12 slices of Bread (remove crust)
Butter
Hamburger (approximately 1 pound, I think)
2 small or 1 medium onion
1 can cream of mushroom soup
1 egg
garlic
½ cup grated cheese
½ cup bread crumbs, optional
Salt and pepper
1 teaspoon Worcestershire sauce

Butter bread. Fit into muffin tins, buttered side sdown. Brown hamburger; drain off fat. (or use hamburger from freezer - see Quick Tip) Finely chop onion; add to meat. Add remaining ingredients. Mix well. Pack into bread shells. Bake at 350° for 30 minutes.