Frozen Berry Swirl Sheet Cake Recipe

Ingredients

• 2 ¼ cups graham cracker crumbs
• ⅓ cup granulated sugar
• 9 tablespoons unsalted butter, melted
• ⅛ teaspoon kosher salt
• 1 cup fresh blueberries
• ¼ cup water
• 3 tablespoons granulated sugar
• 1 tablespoon light corn syrup
• ¾ teaspoon cornstarch
• ½ teaspoon lemon zest
• 1 cup fresh raspberries
• 1 teaspoon cornstarch
• 2 (8-ounce) packages cream cheese, softened
• 1 ½ cups confectioners’ sugar
• 1 cup sour cream
• 3 cups heavy whipping cream