Step 1: Make the Filling
In a large bowl, whisk together the cold milk and instant vanilla pudding mix until thickened, about 2 minutes. Gently fold in the whipped topping until fully combined and creamy.

Step 2: Start the Layers
Place a single layer of graham crackers on the bottom of your 9×13-inch dish. Break pieces if needed to fully cover the base.

Step 3: Add the Filling
Spread half of the vanilla pudding mixture evenly over the graham crackers. Add a layer of fresh strawberry slices on top.

Step 4: Repeat
Add another layer of graham crackers, then spread the remaining pudding mixture on top. Add another layer of strawberry slices.

Step 5: Final Layer
Top everything with one last layer of graham crackers. Spread a generous layer of strawberry frosting or warmed strawberry jam across the top.

Step 6: Chill
Cover the dish with foil or plastic wrap and refrigerate for at least 4 hours, or overnight if possible. The chilling time softens the crackers into a cake-like texture.

Step 7: Serve
Slice into squares and garnish with more fresh strawberries or a mint sprig before serving.