Prepare the Brownies – Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish. Mix strawberry cake mix, egg, melted butter, and heavy cream until smooth. Fold in white chocolate chips, then spread batter evenly in the pan.
Bake – Bake for 20–25 minutes or until set. Let cool completely before frosting.
Make the Frosting – Beat cream cheese, powdered sugar, sour cream, and vanilla extract until smooth. Fold in whipped topping for a fluffy texture.
Assemble – Spread frosting over the cooled brownie base.
Prepare the Topping – Crush vanilla sandwich cookies and mix with strawberry syrup. Sprinkle evenly over the frosted brownies.
Chill & Serve – Refrigerate for at least 1 hour before slicing and serving.