01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan with cooking spray or butter.
02 - In a large bowl, whisk together strawberry cake mix, eggs, vegetable oil, and water until just combined. Pour batter evenly into the prepared pan.
03 - In a separate bowl, beat cream cheese and butter until smooth. Add powdered sugar and vanilla extract; beat until creamy and fluffy.
04 - Drop spoonfuls of cream cheese mixture randomly over the cake batter. Sprinkle diced strawberries and white chocolate chips evenly over the top. Add shredded coconut if using.
05 - Use a butter knife to gently swirl the cream cheese mixture through the batter for a marbled effect. Do not overmix.
06 - Bake for 40-45 minutes, until edges are set and center is slightly wobbly. The cake should remain gooey inside; do not overbake.
07 - Cool in the pan for at least 30 minutes before slicing and serving. Serve warm or at room temperature.