01 - Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it up with a spoon, until browned and no longer pink, about 5 minutes. Drain excess fat if needed.
02 - Add the diced onion, green bell pepper, and minced garlic to the skillet. Sauté for 4–5 minutes until the vegetables are softened.
03 - Stir in the tomato sauce, ketchup, tomato paste, Worcestershire sauce, mustard, brown sugar, smoked paprika, salt, black pepper, and chili powder (if using).
04 - Reduce heat to low and simmer uncovered for 10–12 minutes, stirring occasionally, until the sauce thickens and flavors meld. Taste and adjust seasoning as needed.
05 - While the filling simmers, heat a large skillet or griddle over medium heat. Spread butter on the cut sides of each bun and toast until golden brown, about 2 minutes.
06 - Spoon generous portions of the sloppy joe mixture onto the toasted buns. Top with pickle chips if desired. Serve immediately.