Mississippi Mud Mashed Potatoes

Heat oven to 350°F. Spray 2- to 2 1/2-quart oval casserole or baking dish with cooking spray.

In 4-quart saucepan, heat water and milk to boiling; remove from heat. Stir in both pouches of potatoes just until moistened. Let stand about 1 minute or until liquid is absorbed. Beat with fork until smooth.

Set 1/4 cup of the bacon aside for garnish. Gently fold mayonnaise, 1 1/2 cups of the cheese and remaining bacon into the mashed potatoes. Spoon mixture into baking dish. Bake uncovered 25 minutes. Sprinkle top with reserved bacon and remaining 1/2 cup cheese. Bake 5 minutes longer or until cheese is melted. Sprinkle with green onions.