Heat oven to 350°F. Spray 8-inch square (2-quart) glass baking dish with cooking spray. To potatoes, add whipping cream, 2 tablespoons butter, the maple syrup and salt. Mash with potato masher or electric mixer until smooth. Spoon into baking dish. In small bowl, mix crushed granola bars and 2 tablespoons melted butter; sprinkle over potatoes.