01 - Preheat the oven to 350°F. Grease a 9x13-inch baking pan thoroughly with cooking spray or butter.
02 - In a medium bowl, toss the sliced strawberries with granulated sugar until evenly coated. Set aside to macerate while preparing the batter.
03 - In a large bowl, combine strawberry cake mix, melted butter, eggs, and milk. Beat with an electric mixer or whisk until smooth and well-combined, about 2 minutes. Spread the batter evenly into the prepared pan.
04 - Evenly scatter the sugared strawberries, white chocolate chips, and shredded coconut (if using) over the surface of the cake batter.
05 - In a separate bowl, beat cream cheese and softened butter with an electric mixer until smooth and creamy, about 2 minutes. Add powdered sugar and vanilla extract, mixing until fluffy and fully combined.
06 - Drop spoonfuls of the cream cheese mixture randomly over the cake batter. Use a butter knife to gently swirl the cream cheese into the batter, creating a marbled effect. Be careful not to overmix—the distinct layers create the earthquake appearance.
07 - Bake for 38 to 42 minutes, or until the cake is set around the edges but still slightly gooey in the center. The top should appear cracked and marbled. Do not overbake, as the gooey texture is essential to this dessert.
08 - Allow the cake to cool in the pan for 15 to 20 minutes before slicing. Serve warm or at room temperature. The cake is best enjoyed the same day but can be stored covered at room temperature for up to 2 days.