Preheat your oven to 350°F (175°C).
Grease a bundt pan with cooking spray or butter.
In a bowl, mix granulated sugar and cinnamon.
Cut each biscuit into quarters.
Roll each piece in the cinnamon-sugar mixture until coated.
Layer half of the coated biscuit pieces in the bundt pan.
Sprinkle half of the nuts (if using) on top.
Pour half of the melted butter and half of the brown sugar over the layers.
Repeat the layering with the remaining biscuit pieces, nuts, butter, and brown sugar.
Bake for 30 minutes or until golden brown, then let cool for 10 minutes before inverting onto a plate.