Birthday Cake Cinnamon Rolls

Grease bottom and sides of 13x9-inch pan or 2 (9-inch) round cake pans with shortening or cooking spray. Set aside.

In small bowl, stir warm water and yeast until dissolved.

In large bowl, stir cake mix and 2 cups of the flour. Add yeast mixture; stir with wooden spoon until dough forms. Add remaining flour 1/4 cup at a time, stirring after each addition, until dough comes together in a ball. Cover with plastic wrap; let rise in warm place until dough has almost doubled in size, about 1 hour.

Gently punch down dough, and then reshape into ball. On lightly floured surface, flatten dough with hands or rolling pin into 18x12-inch rectangle. Brush with melted butter; sprinkle with cinnamon, brown sugar and sprinkles. Roll rectangle up tightly, beginning at 18-inch side. Pinch edge of dough into roll to seal. Cut into 12 rolls.

Place rolls in pan(s); cover with plastic wrap. Let rise in warm place until dough has almost doubled in size, about 30 minutes. Meanwhile, heat oven to 375°F (350°F for dark or nonstick pan(s)).

Bake 20 to 22 minutes for 13x9-inch pan; 16 to 18 minutes for 9-inch round pans or until golden brown. Cool 5 minutes; spread with frosting. Sprinkle with additional sprinkles. Serve warm or at room temperature. Store tightly covered at room temperature.