Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.

Cook the beef: In a skillet over medium heat, add olive oil and sauté chopped onion until soft. Add ground beef and cook until browned. Drain excess fat.

Stir in garlic powder, salt, pepper, ketchup, and mustard. Mix well and cook for 2 more minutes. Let the mixture cool slightly.

Flatten biscuits: Separate biscuits and flatten each into a 4-inch circle using your hands or a rolling pin.

Fill and seal: Place about 1 tablespoon of the beef mixture in the center of each dough circle. Add a small spoonful of shredded cheese or a cube of cheese on top. Fold edges over and pinch to seal completely.

Place seam-side down on the prepared baking sheet.

Brush with garlic butter: Mix melted butter and garlic powder. Brush the tops of the bombs, then sprinkle with Parmesan cheese.

Bake for 15–18 minutes, or until golden brown.

Let cool for a few minutes, then garnish with chopped parsley if desired