1-Gather all of the ingredients: Gather all of the ingredients.
2-Preheat the oven to 350 degrees Fahrenheit: Preheat the oven to 350 degrees Fahrenheit and lightly grease a 9×13-inch baking dish with baking spray.
3-In a medium-sized mixing bowl, combine the: In a medium-sized mixing bowl, combine the cake mix, egg, melted butter, and heavy cream until smooth and combined.
4-Fold in the white chocolate chips and: Fold in the white chocolate chips and then spread the mixture into an even layer in the prepared baking pan.
5-Bake for 18-23 minutes or until a: Bake for 18-23 minutes or until a toothpick inserted in the center comes out clean and the edges are golden brown.
6-Allow the brownies to cool to room: Allow the brownies to cool to room temperature.
7-In a large mixing bowl, beat the: In a large mixing bowl, beat the cream cheese and powdered sugar with a hand or stand mixer until smooth and fluffy.
8-Beat in the sour cream and vanilla: Beat in the sour cream and vanilla until combined.
9-Lightly fold the whipped topping and spread: Lightly fold the whipped topping and spread the mixture over the cooled brownies.
10-Place the sandwich cookies in a food: Place the sandwich cookies in a food processor and pulse several times until roughly crumbled but not completely crushed.
11-Add the strawberry syrup and pulse until: Add the strawberry syrup and pulse until the cookies are evenly coated and slightly pink.
12-Sprinkle the mixture over the top of: Sprinkle the mixture over the top of the brownies, cut into squares, and serve or chill until ready to serve.