1. Grease muffin tins with cooking spray. Flatten each biscuit and press into muffin tins. Set aside.
2. Brown ground beef in skillet; drain.
3. Mix ketchup, brown sugar, vinegar and chili powder in a small bowl. (This is a wondeful homemade BBQ sauce.) Add to meat and mix well.
4. Spoon meat mixture into muffin cups and sprinkle with cheese.
5. Bake at 375 degrees for 18-20 minutes.