Ground Beef Biscuit Stew

1 lb ground beef
1 medium onion, chopped
1 can (14 1/2 oz) stewed tomatoes, cut up
1 pkg (10 oz) frozen mixed vegetables
1 can (8 oz) tomato sauce

Biscuits:
1 cup all-purpose flour
1 1/2 tsp baking powder
2 Tbsp shortening
2/3 cup milk
1 tsp prepared mustard
1/2 cup shredded cheddar cheese, divided

In a large skillet, cook beef and onion over medium heat, until meat is no longer pink; drain.  Stir in the tomatoes, mixed vegetables, and tomato sauce.  Transfer to a greased 11x7 baking dish.  Cover and bake at 400 degrees for 15 minutes.

For biscuits, in a bowl, combine flour and baking powder.  Cut in shortening until mixture resembles coarse crumbs.  With a fork, stir in milk and mustard until mixture forms a soft dough.  Add 6 Tbsp cheese.  Drop by tablespoonfuls onto stew.  Bake for 15-20 minutes or until golden brown; sprinkle with remaining cheese