Preheat your oven to 400°F (200°C). Gather your ingredients and prepare your cooking space.

In a large skillet, heat cooking oil over medium heat. Add ground beef and chopped onion. Cook for 7-10 minutes until the beef is browned and the onion is translucent. Drain fat, then stir in salt, pepper, garlic powder, and Worcestershire sauce.

Grease a 9-inch pie dish with cooking spray or butter. Spread the seasoned ground beef and onion mixture across the bottom of the dish.

Sprinkle a layer of shredded cheddar cheese over the beef mixture evenly.

In a mixing bowl, whisk together eggs, milk, and flour until smooth. Pour this over the cheese layer in the pie dish.

Bake in the preheated oven for 25-30 minutes until golden-brown and firm to the touch.

Remove the pie from the oven and let it cool for about 10 minutes before slicing.