Peel, core and slice apples. Cut apples in half. Combine apple slices, caramel topping and flour. Spoon into baking dish. Peel apart each biscuit into two thinner biscuits and place on top of apples. Combine melted butter, brown sugar and chopped nuts. Spread over top of biscuits. Bake for 25 minutes. Delicious served warm with vanilla ice cream!