Heat a skillet over medium heat, cook ground beef until browned, and drain excess grease.
Add onion, bell pepper, and garlic to the skillet. Cook for 3-5 minutes, stirring until softened.
In a bowl, mix ketchup, tomato paste, brown sugar, mustard, Worcestershire sauce, smoked paprika, chili powder, salt, and pepper.
Pour sauce into the skillet, stir, and let simmer for 10-15 minutes until thickened.
Serve the sloppy joe mixture on toasted hamburger buns.
