Place potato pieces in 4-quart saucepan or Dutch oven. Add enough water to cover; heat to boiling. Reduce heat to medium-low; cook uncovered 15 to 20 minutes or until tender. Drain and return to saucepan.
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.
Bake uncovered 25 to 30 minutes or until thoroughly heated and topping is crisp.