Season the ground beef and begin browning it in a medium pan over high heat.

Once the meat has fully cooked, drain any excess fat and set the meat aside.

Dice green pepper and onion into small pieces, then saute them in the same pan with a bit of butter. Add salt and pepper then remove from heat once the onions become translucent.

In a small bowl, combine ketchup, mustard, brown sugar, chili powder, red pepper flakes, and worcestershire sauce. Stir until there are no more clumps of sugar.

Return the meat to the pan along with the sauce and vegetables. Mix it all together until the sauce evenly coats the meat. Allow the sloppy joe mixture to cook until it thickens, about 10-15 minutes.

Plate and serve over hamburger buns and enjoy!