Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish
Prepare strawberry cake batter according to package instructions
Pour batter evenly into prepared dish
Sprinkle shredded coconut evenly over the batter
Scatter white chocolate chips across the surface
Beat cream cheese until smooth
Mix in melted butter until combined
Gradually add powdered sugar and stir in vanilla until creamy
Spoon cream cheese mixture randomly over the cake batter without spreading
Bake uncovered for 45–50 minutes until the center is set but still slightly gooey
Cool at least 30 minutes before slicing