In a large bowl, combine the beef, onion, garlic, chili powder, cumin, paprika, salt, and pepper. Mix until all the ingredients are evenly distributed.
Form the mixture into 12 kabobs, about 2 inches in diameter.
Place the kabobs onto the preheated grill. Grill for 5-7 minutes per side, or until the beef is cooked through and the vegetables are tender.
Mix together the bell peppers, mushrooms, and barbecue sauce in a bowl. Brush the mixture onto the kabobs while they are still on the grill.
Grill for an additional 1-2 minutes, or until the peppers and mushrooms are tender and the sauce is heated through.
Serve hot.
Interesting Facts
Kabobs originated in the Middle East and have been around for centuries.
Kabobs can be made with a variety of different meats and vegetables, so they are very versatile.
Kabobs are a great way to add flavor to any meal and they are easy to make.