Line a baking sheet with parchment. In a small bowl, mix brown sugar, sugar and cinnamon.
On a lightly floured surface, roll dough into a 12x8-in. rectangle. Spread with butter to within 1/2 in. of edges; sprinkle with sugar mixture. Roll up jelly-roll style, starting with a long side; pinch seam to seal. Cut into 12 slices.
Center 1 slice near top of prepared pan, cut side down. Closely arrange 9 more slices to form 3 additional rows, adding 1 slice per row, to form a tree. Center remaining 2 slices at base of tree for trunk. Cover with a kitchen towel; let rise in a warm place until doubled, about 30 minutes. Preheat oven to 350°.
Bake 18-20 minutes or until golden brown. Spread with frosting; serve warm.
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