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Heat a large skillet over medium heat.
Cook and stir lean ground beef in the hot skillet until some of the fat starts to render, 3 to 4 minutes.
Add onion and bell pepper; continue to cook until vegetables have softened and beef is cooked through, 3 to 5 more minutes.
Stir in ketchup, brown sugar, mustard, and garlic powder; season with salt and pepper.
Reduce heat to low and simmer for 20 to 30 minutes.
Divide meat mixture evenly among hamburger buns.