01 - Preheat oven to 350°F (180°C). Grease bundt pan with softened butter or nonstick spray.
02 - Open refrigerated biscuit or cinnamon roll dough. If using biscuits, cut each into quarters; for cinnamon rolls, cut into bite-sized pieces.
03 - Mix granulated sugar and ground cinnamon in a bowl. Toss dough pieces in the mixture until fully coated.
04 - Arrange coated dough pieces evenly in the greased bundt pan.
05 - Combine melted butter, light brown sugar, and vanilla extract until smooth. Pour over the dough pieces in the pan.
06 - Bake for 30 to 35 minutes, or until golden brown on top and cooked through.
07 - Allow to cool in the pan for 10 minutes. Invert carefully onto a serving plate.
08 - Whisk together powdered sugar, milk, and vanilla extract until smooth.
09 - Drizzle icing over the warm monkey bread before serving.