Spray a large, nonstick skillet with non-fat cooking spray and set over medium-high heat. Add in onions and garlic and sauté until just becoming tender, about 3 minutes.

Add in the ground beef, steak seasoning, and pepper, and cook, while breaking apart, until meat is cooked through browned.

Add bell peppers, vinegar, and Worcestershire sauce and reduce heat to medium. Cook for another 5 minutes.

Stir in diced tomatoes, ketchup, and tomato paste. Cook for another 5-8 minutes.

Using a large spoon, pile sloppy joe meat onto bun bottoms and cover with bun tops