1. Prepare potatoes according to package directions.
2. Stir in spreadable cheese and next 4 ingredients; stir until blended. Spread mixture on bottom of a lightly-greased 11- x 7-inch baking dish; top with Cheddar cheese.
3. Bake at 350° for 25 to 30 minutes or until thoroughly heated. Garnish, if desired.
Note: For testing purposes only, we used frozen Ore-Ida Mashed Potatoes and Alouette Garlic & Herbs Spreadable Cheese.