Preheat your oven to 375°F (190°C).
In a skillet, cook the ground beef over medium heat until browned. Drain any excess fat, then add the diced onion and cook until softened.
Season the beef mixture with salt, pepper, and mustard (if using).
In a mixing bowl, whisk together the milk, mayonnaise, flour, and eggs until smooth.
Spread the cooked beef mixture evenly in the pie crust, then pour the milk mixture over the top.
Sprinkle the shredded cheddar cheese on top.
Bake for 30-35 minutes, or until the pie is set and the top is golden brown.
Let it cool for a few minutes before slicing and serving.
Note:
This cheeseburger pie is incredibly versatile — you can add chopped pickles, crumbled bacon, or a dash of hot sauce to the beef mixture for extra flavor. Want a lower-carb version? Skip the crust and bake it as a crustless casserole. It also reheats beautifully, making it perfect for leftovers or meal prep.
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