Preheat your oven to 400 degrees F.

In a large bowl, mix together the ground beef, breadcrumbs, egg, milk, chopped onion, salt, black pepper, and garlic powder until just combined.

Form the mixture into 1-inch meatballs and place them on a baking sheet lined with parchment paper.

Bake the meatballs in the preheated oven for 15-20 minutes, or until they are browned and cooked through.

While the meatballs are baking, pour the BBQ sauce into a saucepan and warm over medium heat until it begins to simmer.

Once the meatballs are done, transfer them to the saucepan and gently toss them with the BBQ sauce until they are well coated.

Serve the BBQ meatballs warm, garnished with parsley if desired.