Preheat oven to 375. Separate biscuits and flatten into 5 inch circles. Press into greased muffin tin. Set aside.
In a skillet, brown ground beef;drain. In a small bowl, mix ketchup, brown sugar, cider vinegar, and chili powder until smooth. Add to meat and mix well.
Divide meat among biscuit cups using about a 1/4 cup each.( Tip: I use an ice cream scoop for easy filling.) Bake for 15 minutes. Remove from oven;sprinkle with cheese and bake 3-5 minutes longer until golden brown and cheese is melted.