01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan with cooking spray or butter.
02 - Combine strawberry cake mix, eggs, vegetable oil, and water in a large bowl. Mix with electric mixer on medium speed until batter is smooth and well blended, about 2 minutes.
03 - Pour cake batter evenly into the prepared baking pan, spreading to reach all corners.
04 - Sprinkle chopped strawberries, shredded coconut, and white chocolate chips evenly over the surface of the cake batter.
05 - Beat cream cheese and softened butter together in a separate bowl until smooth and creamy. Gradually add powdered sugar, beating continuously until fully incorporated and fluffy.
06 - Drop large spoonfuls of the cream cheese mixture randomly across the top of the cake, spacing them evenly over the surface.
07 - Using a butter knife, gently swirl the cream cheese mixture into the cake batter in a figure-8 or circular motion. Take care not to overmix—you want distinct marbled patterns, not a fully blended batter.
08 - Bake for 45 minutes until edges are set and lightly golden, while the center remains slightly wobbly. The cake will continue to set as it cools.
09 - Let cake cool in the pan for at least 30 minutes before serving. Serve warm for a gooey texture or at room temperature for easier slicing.