*The blueberries should not be thawed.

**Should leave this out and use a bit of potato flour or cake meal instead.

In food processor or mixing bowl, combine flour, sugar, baking powder, margarine, egg whites, and vanilla; mix well. Press into bottom of 10-inch springform, flan, or square cake pan; sprinkle with blueberries. Topping: In bowl, sprinkle flour over yogurt. Add egg, sugar, rind, and vanilla; mix until smooth. Pour over berries. Bake in 350 F oven for 60 to 70 minutes or until golden. Serve warm or cold. Per serving: 232 calories, 6 g fat, 25 mg cholesterol, 89 mg sodium, 5 mg protein, 40 g carbohydrate