This is a hit with my entire family (OK, so there are only three of us, but one of us is 2 years old, so I consider this a victory).
1 frozen pie crust
1 pound extra-lean ground beef (or use regular and drain it after you brown it)
1/2 small onion, chopped finely
1/2 cup water
1/2 cup crumbs (cornflake, bread, cracker...doesn't really matter)
1/2 cup ketchup (or bbq sauce, or 1/4 cup of each)
squirt of mustard (any kind; we often use honey mustard)
salt, pepper and Mrs Dash Italian flavour to taste
1/2 tsp (or more if you like it spicy) crushed red pepper flakes or chili sauce
3/4 cup shredded Cheddar or mozzarella cheese
Thaw pie crust at room temperature.
Preheat oven to 375F.
Brown ground beef and onions in a skillet until meat is cooked through and onions are soft. Drain off excess fat if necessary. Add water and mix well to combine.
Add crumbs, ketchup, mustard and seasonings. Mix together. Pour mixture into pie shell and smooth top. Cover with tin foil and bake for about 30 minutes, give or a take a few.
After 30 minutes of cooking, remove foil and sprinkle cheese over top of pie. Return to oven for five minutes, or just until cheese bubbles. Allow pie to stand for 5 minutes before serving.
You really don't need much else with this other than a salad, but I have been known to choke down a few fries or some mashed potatoes alongside :)