Mix brownies according to package directions and bake on a 12” pizza pan for 18-20 minutes. Cool. Mix 1 pkg softened cream cheese, 1/2 c. sugar and 1 tsp vanilla until well blended. Spread on brownie base. Chill. Rinse 1 c. blueberries and 1 c. raspberries. Remove stems and slice 1 c. strawberries. Rinse. Let drain and pat dry. Stir in 1 c. apple jelly with the fruit right before serving and spread over top of cream cheese mixture. Serve immediately.