Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish and set aside.
Heat a large skillet over medium-high heat. Add ground beef and diced onion, breaking up the meat with a wooden spoon as it cooks.
Cook for 6 to 8 minutes until the beef is browned and the onion is soft. Drain excess grease if there's more than a tablespoon.
Stir in minced garlic, Worcestershire sauce, smoked paprika, and dried mustard. Cook for 1 minute until fragrant. Season with salt and pepper to taste.
Transfer the beef mixture to the prepared baking dish and spread evenly. Sprinkle 3/4 cup cheddar cheese over the top.
Separate the biscuits and cut each into quarters. Arrange biscuit pieces over the beef and cheese, leaving small gaps between them.
Sprinkle the remaining 1/4 cup cheddar cheese over the biscuits. Bake for 18 to 22 minutes until biscuits are golden brown and cooked through.
While baking, mix melted butter with garlic powder. As soon as the bake comes out of the oven, brush the garlic butter over the hot biscuits.
Garnish with fresh parsley if desired. Let cool for 5 minutes before serving.