1. Combine margarine, Corn Flakes, Cream of Wheat, yogurt, and baking powder. Press into an 8" baking pan.
2. Bake at 375° F until crisp and golden brown (about 20 minutes).
3. Remove and let cool.
4. Reduce heat in the oven to 200°F.
5. Spread frozen dairy dessert over the crust and freeze the pie.
6. Beat egg whites and sweetener until stiff.
7. Cover frozen pie with egg white mixture. Bake at 200°F until meringue is firm on top.