Spray counter lightly with non-stick cooking spray. Roll combined rolls into a 14x14-inch square. Cover with plastic wrap and let rest about 10 minutes.
In a small bowl, combine butter, brown sugar and cinnamon until light and fluffy. Stir in toffee bits.
Remove wrap from dough and spread evenly with butter, brown sugar mixture. Roll up jelly roll style. Using a sharp knife cut into 12 equal slices. Place cut side down in a sprayed 9x13-inch baking pan. Cover with sprayed plastic wrap and let rise until double in size.
Remove wrap and bake at 350°F 20 minutes or until golden brown.
In a small bowl combine icing ingredients and mix until smooth. Drizzle over warm rolls..