01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan and line with parchment paper for easy removal.
02 - Combine cake mix, eggs, oil, and milk in a large bowl. Beat until smooth, then pour into the prepared pan.
03 - Beat cream cheese and butter until fluffy. Add powdered sugar and vanilla, beating until smooth.
04 - Drop spoonfuls of cheesecake mixture evenly over the cake batter. Gently swirl with a knife or spatula to create a marbled effect.
05 - Dollop strawberry pie filling over the surface. Distribute sliced fresh strawberries evenly. Swirl gently again to create a dramatic pattern.
06 - Sprinkle white chocolate chips and sliced almonds (if using) evenly over the top.
07 - Bake for 45-50 minutes until edges are golden and center is mostly set. A slight wobble in the center is acceptable.
08 - Let cool in the pan for at least 20 minutes before slicing and serving.