Step 1

Line a baking sheet with parchment paper.

Step 2

In a medium bowl, mix together the cookie crumbs and butter until fully incorporated.

Step 3

Pour the crumbs into the prepared baking sheet and press firmly in an even layer. Transfer to the refrigerator to firm, about 1 hour.

Step 4

In a medium saucepan over medium-low heat, combine the blueberries, strawberries, raspberries, and sugar. Stir until the sugar dissolves, about 5 minutes.

Step 5

In a small bowl, whisk together the cornstarch and water until a smooth paste forms.

Step 6

Add the cornstarch slurry to berries and stir to combine. Stir in the cinnamon and salt.

Step 7

Let the berry mixture cool completely, about 1 hour, before pouring over the crust. Top with the mixed berries.

Step 8

Slice into 12 bars and serve with a dollop of whipped cream.

Step 9

Enjoy!