Preheat a large skillet over medium/high heat. Add the oil, onion, bell pepper and a pinch of salt. Cook for 3-4 minutes until veggies begin to soften.
Add the ground beef, salt, pepper, garlic powder, paprika and chili powder and cook for 5-7 minutes until meat is browned.
Add the ketchup, mustard, Worcestershire sauce, tomato paste and water. Mix with beef mixture until well combined and a bit saucy.
Heat a separate pan over medium/high heat and add 1 tablespoon of butter. Place the hamburger buns face down in the pan to brown the inside, about 2-3 minutes. Remove, add more butter if needed and repeat with remaining buns. Serve the sloppy joe mixture on the toasted buns and enjoy.
