Preheat the oven to 350F and line a standard 12 well muffin tin with parchment paper or liners.
Cut each jumbo cinnamon roll into 6 pieces (60 pieces total).
Prepare one bowl with the mixed granulated sugar, brown sugar, and cinnamon. And another bowl with the melted butter.
Dip each cinnamon roll piece into the melted butter, then roll in the cinnamon-sugar mixture.
Add 5 coated dough pieces to each well. Sprinkle any leftover cinnamon-sugar evenly over the tops.
Bake for 20-22 minutes, until golden, puffed, and slightly firm to the touch.
Cool completely before frosting.