1. In 9 x 9 x 2-inch baking dish toss together fruit, 1/4 cup sugar, cornstarch and vanilla. Set aside.
2. In medium bowl stir together KELLOGG'S MINI-WHEATS STRAWBERRY DELIGHT cereal, flour, 3 tablespoons of the sugar, baking powder, baking soda and salt. Cut in butter until mixture resembles coarse crumbs. Stir in sour cream until soft dough forms.
3. Drop dough into 9 mounds on top of fruit mixture. Sprinkle with remaining 1 tablespoon sugar. Bake at 350°F about 1 hour or until fruit mixture is bubbly and dumplings are golden brown. Let stand for 10 minutes. Serve warm with yogurt or ice cream, if desired.