Preheat oven to 325 degrees F. Coat a large fluted tube cake pan with non-stick spray and set aside.
Open biscuits and separate. Cut each biscuit into quarters.
In a large zip close bag combine 1 cup sugar and 2 tsp cinnamon. Shake to mix together. Add in the biscuits and shake to coat evenly. Place coated biscuits in the prepared pan.
Combine the melted butter and brown sugar and stir until smooth. Pour mixture over the biscuits. Bake for 50 minutes, or until golden brown and no longer doughy in center. Cool in pan for 10 minutes, then turn over on serving platter.
In a small bowl whisk together the powdered sugar, milk, vanilla extract and salt until a thick glaze consistency. If too thick, add a little more milk to thin. Drizzle over the top of the monkey bread and enjoy!