Preheat your oven to 400°F (200°C).

In a skillet over medium heat, add your ground beef and chopped onions. Cook for about 8-10 minutes, stirring occasionally, until the meat is browned and the onions are translucent.

Once the beef and onions are cooked, sprinkle in salt, black pepper, garlic powder, and Worcestershire sauce (if desired). Stir well to incorporate the spices.

Grease your pie dish with cooking spray or butter, ensuring it's well-coated to prevent sticking. Spread the seasoned beef and onion mixture across the bottom of the dish.

Generously sprinkle shredded cheddar cheese over the beef layer.

In a mixing bowl, whisk together the eggs, milk, and all-purpose flour until smooth. Pour this mixture over the layered beef and cheese.

Carefully transfer your assembled pie into the preheated oven and bake for 25-30 minutes until the top is golden brown.

Once baked, remove the pie from the oven and allow it to cool slightly for about 5-10 minutes.