Preheat your oven and grease or line a baking pan with parchment paper. This helps the brownies release easily and keeps edges from sticking. A prepared pan saves time during cleanup.
Mix the strawberry cake mix, egg, melted butter, and heavy cream until smooth. Stir in white chocolate chips gently. Spread the thick batter evenly into the prepared pan.
Bake until the edges are set and a toothpick inserted comes out mostly clean. Let the brownies cool completely before adding any topping to prevent melting or sliding.
Beat the cream cheese and powdered sugar until smooth. Add sour cream and vanilla, then gently fold in whipped topping. This creates a light, spreadable frosting.
Crush the vanilla cookies into small crumbs. Drizzle in strawberry syrup and pulse or mix until evenly coated. The crumbs should be slightly chunky for texture.
Spread the frosting evenly over the cooled brownie base. Sprinkle the strawberry crunch topping generously on top. Slice into squares and chill before serving for clean cuts.