Preheat the oven to 400°F (200°C).
In a large mixing bowl, combine ground beef, breadcrumbs, onion, egg, whiskey, peach preserves, barbecue sauce, garlic powder, smoked paprika, salt, and pepper.
Shape 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 20-25 minutes, or until they are browned and cooked through.
While the meatballs are cooking, heat additional barbecue sauce mixed with a bit of whiskey in a saucepan over medium heat.
Once cooked, remove the meatballs from the oven and let them rest for 5 minutes before tossing them in the warmed sauce.
Serve the whiskey peach BBQ meatballs warm, garnished with fresh herbs if desired.