1. Preheat your oven to 375°F and line a baking sheet with parchment paper.
2. In a large mixing bowl, combine the ground beef, breadcrumbs, milk, onion, egg, Worcestershire sauce, garlic powder, salt, and pepper. Mix until well combined.
3. Take a small amount of the meat mixture and flatten it into a disc in your hand. Place a cube of cheddar cheese in the center and fold the meat around it, forming a ball. Repeat with the remaining mixture and cheese.
4. Arrange the meatloaf bites on the prepared baking sheet, leaving space between each bite.
5. In a small bowl, mix together the ketchup, brown sugar, and mustard. Brush this sauce over each meatloaf bite.
6. Bake in the preheated oven for 20-25 minutes, or until the meat is cooked through and the tops are slightly caramelized.
7. Let them cool for a few minutes before serving, allowing the cheese to set slightly.

Remember, like my abuela always said, “Cooking is an art, not a science.” Feel free to adjust the seasoning to your preference or add herbs like parsley or thyme for an extra layer of flavor.