Icing:
2 cups confectioners’ sugar
2 tablespoons butter, softened
1 teaspoon vanilla extract
3 to 5 tablespoons 2% milk
Directions
Combine cake mix, 1 cup flour and yeast. Add water; beat on medium speed 2 minutes. Stir in enough remaining flour to form a soft dough (dough will be sticky). Turn onto a lightly floured surface; knead gently 6-8 times. Place in a greased bowl, turning once to grease the top. Cover and let rise in a warm place until doubled, about 2 hours. Meanwhile, in another bowl, mix brown sugar and cinnamon.
Punch down dough. Turn onto a lightly floured surface; roll dough into an 18×10-in. rectangle. Brush with melted butter to within 1/4 in. of edges; sprinkle with sugar mixture.
Roll up jelly-roll style, starting with a long side; pinch seam to seal. Cut crosswise into 12 slices. Place cut sides up in a greased 13×9-in. baking pan. Cover with a kitchen towel; let rise in a warm place until almost doubled, about 1 hour.
Preheat oven to 350°. Bake until puffed and light brown, 15-20 minutes. Cool slightly.
Beat confectioners’ sugar, butter, vanilla and enough milk to reach a drizzling consistency. Drizzle icing over warm rolls.