1Chop the green bell pepper, red bell pepper, and onion.
2Mix together the ground beef, chopped vegetables, milk-soaked breadcrumbs, and eggs in a large bowl. Season with salt and pepper.
3Shape the mixture into a loaf and place it in a baking dish.
4Mix together ketchup and BBQ sauce; spread over the meatloaf.
5Bake in a preheated oven at 350°F (175°C) for about an hour, or until cooked through.
6Prepare the BBQ glaze by melting butter in a saucepan. Add ketchup, BBQ sauce, Worcestershire sauce, garlic powder, onion powder, and minced garlic; mix well.
7Fifteen minutes before meatloaf is done, remove from oven and spread glaze evenly over the top.
8Return to the oven to finish baking until glaze thickens and caramelizes.
9Meanwhile, prepare mashed potatoes.
10Serve the meatloaf with mashed potatoes and extra glaze.