Preheat oven to 350F
Using an electric mixer with the paddle attachment, combine the cake mix and butter until crumbly.
Add the egg and vanilla and mix completely. The dough will be thick.
Press the dough into a 9x13 baking dish sprayed with cooking spray.
Pour the strawberry topping over the cake mix dough. Sprinkle with the coconut, white chocolate chips, and snowcap candies.
Pour the entire can of sweetened condensed milk over everything.
Bake for 35 minutes.
Be sure to cool completely before cutting into squares.