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 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 cake batter. Sprinkle diced strawberries and white chocolate chips evenly over top. Add shredded coconut if desired.
05 - Use a butter knife to gently swirl cream cheese mixture through batter for marbled effect. Avoid over-mixing.
06 - Bake for 40-45 minutes until edges are set and center is slightly wobbly. Do not overbake; cake should remain gooey inside.
07 - Cool in pan for at least 30 minutes before slicing and serving. Serve warm or at room temperature.