Heat oven to 325. Spray a 2-quart casserole dish w/ cooking spray. In bowl, beat "butter," and Splenda until smooth. Add cheese, mix well. Add flour, mix well. Batter will be a little stiff. Arrange apple slices in layers in baking dish. Spread cheese mix completely over apples. Bake, uncovered for 30-45 min, or until bubbly.