- In a large mixing bowl, combine the sliced strawberries and powdered sugar. Toss gently and let them sit for about 10 minutes to release their juices. 
- In another bowl, mix the whipped topping, vanilla yogurt, and vanilla extract until well combined. 
- Gently fold the strawberry mixture into the yogurt mixture until evenly distributed. 
- Add the bite-sized pieces of angel food cake and fold them in carefully to avoid breaking them apart. 
- Serve the salad in individual bowls or a large serving dish, and sprinkle the crushed graham crackers on top for added crunch. 
- Chill in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.