OK, nothing fancy. I made this one up when the kids were small because I didn't feel like making and frying individual hamburgers, and besides I was out of buns and didn't want to run to the store.
Now it's one of the "comfort food memories" of our family.
Brown the ground beef and the onion in a medium skillet over medium heat. Cook just enough to get the pink out; do not let it dry out.
Spread the Crescent roll dough like a crust over the bottom of an 8x12-inch baking dish.
Spread the crust with the ketchup. I didn't measure this amount exactly; I just squirted it on until I had enough to spread out. Add a few squirts or squiggly lines of mustard on top of the ketchup. The kids can do all the steps for the crust; they get a kick out of it.
Add salt and pepper to the ground beef, and stir in the mayonnaise until all is well-moistened. Spread the beef mixture evenly over the prepared crust.
Bake for 20 minutes. Then put the cheese evenly on top. Continue baking for another 15-20 minutes, until cheese melts and the crust is done to your liking.
Let cool slightly, about 5 minutes. Cut the pie into squares to serve. Top each serving with the bacon, dill pickle slices, lettuce, tomato, or any other toppings you like on your hamburgers.
ANOTHER OPTION: If you like the taste of a Big Mac, use Thousand Island dressing instead of the mayonnaise.