Preheat the oven as per pie crust instructions.

In a skillet, cook the ground beef and onion over medium heat until the meat is no longer pink; drain excess fat.

Stir in garlic powder, ketchup, mustard, and pickles; mix well.

In a bowl, whisk together eggs and milk.

Combine beef mixture with egg mixture; stir in shredded cheese.

Pour the filling into the pie crust.

Bake according to pie crust instructions or until set and golden brown.

Let cool for a few minutes before slicing and serving.