1. Preheat oven to 400°. Process first 6 ingredients in a blender or food processor until smooth. Transfer mixture to a medium bowl, and stir in whipping cream.
2. Lightly grease a 13- x 9-inch baking dish with cooking spray. Spread one-fourth of potatoes in a single layer in prepared dish; top with one-fourth of cream mixture. Repeat layers three more times with remaining potatoes and cream mixture.
3. Bake, covered, at 400° for 50 minutes. Uncover and sprinkle with cheese and bacon. Bake 20 minutes or until lightly browned and bubbly. Let stand 10 minutes.