Bacon Cheeseburger Potato Pie

Bacon Cheeseburger Potato Pie 1 1⁄2 lbs lean ground beef 1⁄2 cup plain breadcrumbs 1⁄4-1⁄2 cup finely chopped onion 1⁄4 cup ketchup 2 teaspoons prepared mustard 1⁄2 teaspoon salt 3 slices bacon 1 1⁄4 cups water 3 tablespoons margarine or 3 tablespoons butter 1⁄4 teaspoon garlic salt (I use garlic powder though, and extra of it) 3⁄4 cup milk (skim is fine) 2 cups instant mashed potatoes 1 cup shredded cheddar cheese, divided in half 1 medium tomatoes, chopped 2 green onions, sliced (or you can use white onion) Heat oven to 375 degrees F. Combine ground beef, breadcrumbs, onion, ketchup, mustard and salt and mix well. Press hamburger mixture in bottom and up sides of an ungreased 9 inch pie pan to cover completely. Bake in preheated oven for 15 minutes. While meat mixture is baking, cook bacon until crisp. Drain on paper towel, cool, and crumble. Discard bacon drippings or save for another recipe. In a medium sauce pan, combine water, margarine and garlic salt. Bring to a boil. Remove from heat and add milk. With a fork, stir in potato flakes. Then stir in 1/2 cup of cheddar cheese. Remove partially baked"crust" from oven, pour off any fat. Spoon potato mixture into crust evenly. Return to oven for another 10-15 minutes or until meat is thoroughly cooked, and potatoes are heated through. Remove pie from oven. Top with tomato, remaining cheese and crumbled bacon. Return to oven, and bake for 5 minutes longer, until cheese is melted. Remove from oven, top with green onions. Let stand 10 minutes before serving.