01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan thoroughly with cooking spray or butter.
02 - In a large bowl, whisk together the strawberry cake mix, eggs, vegetable oil, and water until just combined. Pour the batter evenly into the prepared pan.
03 - In a separate bowl, beat the cream cheese and butter until smooth. Add powdered sugar and vanilla extract; beat until creamy and fluffy.
04 - Drop spoonfuls of the 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, being careful not to overmix.
06 - Bake for 40-45 minutes, or until the edges are set and the center is slightly wobbly. Do not overbake; the cake should remain gooey inside.
07 - Cool in the pan for at least 30 minutes before slicing and serving. For best results, serve slightly warm.