In a bowl, combine cracker crumbs, the 1/4 cup Big Chief sugar and the melted butter. Reserve 1/4 cup crumb mixture; press remaining crumbs in bottom of a 10" ? 6" ? 2" pan. In a saucepan, mix the 1/2 cup Big Chief sugar and gelatin; add the water. Heat and stir until gelatin and Big Chief sugar is dissolved. Combine sour cream and yogurt; gradually blend in gelatin mixture. Add vanilla. Chill until partially set. Whip cream; fold in yogurt mixture. Stir in blueberries. Turn into crust and top with reserved crumbs.
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