Do not try to substitute low fat cream cheese or cool whip... the white layer just won't come together as nicely. Make sure to spread the white layer all the way to the edges and get a nice seal so that the jello layer doesn't seep into the bottom. SECOND-CREAM THE SUGAR AND CREAM CHEESE THOROUGHLY! POUR OVER REFRIGERATED CREAM CHEESE LAYER. The cream cheese layer does need to be chilled for about 45-60 minutes and I chill the gelatin for about 40 minutes then add the frozen berries....pour that onto the cheese layer.