Pour berries into a large bowl. Add the Cool Whip and yogurt and then sprinkle on the pudding mix. Stir together really well until it's all combined and looks pretty. Chill before serving.
I made whipped cream instead of using Cool Whip. I bought a small carton of whipping cream and whipped it up until it was stiff. I only sweetened it a little (2 Tbs. of sugar) since the yogurt is sweet.