In small saucepan, combine brown sugar, butter, spices and pumpkin. Stir until butter is completely melted and mixture is combined. Remove from heat and stir in vanilla.
Gently pour or spoon pumpkin spice sauce over the biscuit pieces, trying to coat/cover each one.
Bake for 35-40 minutes. Cool 10 minutes, then carefully turn over onto rimmed serving plate. Be careful when turning over, so as not to burn yourself with the hot butter sugar sauce. Serve immediately.