Preheat the oven to 375 degrees F (190 degrees C). Grease a 9x11-inch baking dish.

Place bacon in a large skillet and cook over medium-high heat until edges just start to curl, 1 to 2 minutes per side. Drain partially cooked bacon on a paper towel-lined plate. Reserve about 1 tablespoon bacon drippings in the skillet.

Cook and stir onion and garlic in the bacon drippings until onion is softened, 6 to 7 minutes. Remove from heat and cool.

Mix cooled onion and garlic, ground beef, 1/2 cup barbecue sauce, bread crumbs, eggs, Worcestershire sauce, Dijon mustard, oregano, and chili powder together with your hands in a large bowl until well combined.

Form beef mixture into a log-shaped meatloaf; place in the prepared baking dish.

Wrap partially cooked bacon slices around meatloaf, tucking the ends underneath.

Bake in the preheated oven for 35 minutes.

Brush bacon-wrapped meatloaf with 3 tablespoons barbecue sauce. Continue baking until no longer pink in the center, about 10 more minutes.