step 1 Pulse graham cracker pieces in food processor until ground into fine crumbs.
step 2 In a medium bowl mix graham cracker crumbs and sugar. Add melted butter and work into crumbs with a fork or fingers until well incorporated. Firmly press crumb mixture using hands or a flat-bottom drinking glass evenly into the bottom of cups or serving bowl or container.
step 3 Add blueberries in an even layer on top of crumb crust.
step 4 Add yogurt or pudding in an even layer on top of blueberries.
step 5 Add strawberries or raspberries in an even layer on top of yogurt.
Cover with plastic wrap and chill until ready to serve.