01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan thoroughly with cooking spray or butter.
02 - Combine the strawberry cake mix, eggs, vegetable oil, and water in a large bowl. Beat with electric mixer on medium speed until smooth, about 2 minutes. Pour batter evenly into prepared pan.
03 - In a separate bowl, beat together the softened cream cheese and butter until creamy. Add powdered sugar and vanilla extract, continuing to beat until smooth and well combined, about 2-3 minutes.
04 - Drop spoonfuls of the cream cheese mixture evenly over the cake batter, leaving some gaps. Scatter chopped strawberries and white chocolate chips over the top. Sprinkle with shredded coconut if using.
05 - Using a butter knife or skewer, gently swirl the cream cheese mixture, cake batter, and toppings together in circular motions. Create a marbled earthquake effect without overmixing—maintain distinct pockets of filling.
06 - Bake for 40-45 minutes until the center is just set and a toothpick inserted comes out with a few moist crumbs. The edges should be lightly golden but the center will still have a slight jiggle.
07 - Allow the cake to cool completely in the pan, about 1-2 hours. Slice into squares and serve chilled or at room temperature.