Creating Berry Cheesecake Lasagna is an enjoyable experience. Follow these steps:

1. Prepare the Crust: In a medium bowl, mix the graham cracker crumbs with melted butter until well combined. Press the mixture evenly into the bottom of a 9×13-inch dish.

2. Make the Cheesecake Layer: In a large bowl, beat the softened cream cheese with a hand mixer until smooth. Gradually add in the powdered sugar and vanilla extract until combined.

3. Fold in Whipped Topping: Gently fold the whipped topping into the cream cheese mixture until fully incorporated. This creates the fluffy cheesecake layer.

4. Layer the Cheesecake Mixture: Spread half of the cheesecake mixture over the graham cracker crust. Smooth it out with a spatula.

5. Add Berry Layer: Spoon half of the berry preserves or jam evenly over the cheesecake layer, followed by half of the mixed berries. Distribute them evenly to ensure every bite is delicious.

6. Repeat the Layers: Add the remaining cheesecake mixture on top of the berries, smoothing it out. Layer more berry preserves and the remaining berries on the top, making sure to spread everything evenly.

7. Chill: Cover the dish with plastic wrap and place it in the refrigerator. Allow it to chill for at least 4 hours or overnight for best results.

8. Garnish and Serve: Once chilled and set, slice the Berry Cheesecake Lasagna into squares. Garnish with fresh mint leaves if desired.

These steps will guide you to successfully creating this incredible dessert effortlessly.