Heat olive oil in a large skillet over medium-high heat.
Add ground beef and cook until browned, about 4-5 minutes.
Use a spoon to break up the beef as it cooks.
Stir in chopped onion, green bell pepper, and minced garlic.
Cook for an additional 3-4 minutes until vegetables are tender.
Add brown sugar, steak seasoning, and Worcestershire sauce to the meat mixture.
Stir well to combine the flavors.
Reduce heat to low and pour in the tomato sauce.
Simmer the mixture for about 5 minutes, stirring occasionally.
Gently spoon the sloppy Joe mixture onto the bottom halves of the toasted buns.
Cover with the top halves and serve warm!