Line a quarter sheet pan or small rimmed baking tray with parchment paper or wax paper.
Pour the vanilla yogurt onto the prepared pan and spread it into an even layer about ¼ to ½ inch thick.
Evenly sprinkle the diced strawberries, blueberries, and granola over the yogurt.
Gently press the toppings into the yogurt so they stay in place after freezing.
Freeze for about 3 hours, or until the yogurt is completely firm.
Remove from the freezer and let it sit at room temperature for 2–3 minutes.
Break or cut the Frozen Yogurt Bark into 12–15 pieces.
Serve immediately or store the pieces in the freezer for later.