Creating Homemade Cheeseburger Pie is straightforward if you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Beef: In a skillet over medium heat, brown the ground beef, adding the diced onion. Cook until the beef is no longer pink and the onions are translucent. Drain excess fat.
3. Season the Beef: Stir in Worcestershire sauce, garlic powder, salt, and pepper. Mix well and remove from heat.
4. Combine the Filling: In a bowl, mix the cooked beef and onion with shredded cheddar cheese. If desired, add mustard and ketchup for extra flavor.
5. Prepare the Batter: In another bowl, whisk together the eggs, milk, flour, baking powder, and a pinch of salt until smooth.
6. Assemble the Pie: Pour half of the batter into a greased pie dish. Add the beef mixture on top, then pour the remaining batter over it, covering the filling.
7. Bake: Place the pie in the preheated oven and bake for 30-35 minutes or until golden brown and set in the center.
8. Cool: Remove the pie from the oven and let it cool for 10-15 minutes before slicing.
9. Serve: Cut into wedges and serve warm, garnished with fresh parsley if desired.

Following these steps will guide you in creating a delicious Homemade Cheeseburger Pie that everyone will love!