Preheat your oven to 350°F (175°C).

In a large mixing bowl, combine the yellow cake mix, melted butter, and one egg.

Mix until a thick dough forms, then press it evenly into the bottom of the prepared baking dish using a spatula or your hands.

In another mixing bowl, beat the softened cream cheese until smooth and creamy.

Add the eggs, melted butter, and vanilla extract. Continue mixing until fully combined and silky smooth.

Gradually add the powdered sugar, mixing continuously until no lumps remain.

Pour the cream cheese mixture evenly over the prepared cake base.

Use a spatula to spread the filling gently, ensuring it completely covers the bottom layer.

Place the baking dish into the preheated oven.

Bake for 40–45 minutes, or until the edges are lightly golden while the center remains slightly soft and gooey. Avoid overbaking, as the signature texture comes from the moist center.

Remove the cake from the oven and place it on a cooling rack. Let it cool completely for at least 1 hour. As it cools, the cream cheese layer will set while remaining deliciously gooey in the center.

Dust the top generously with powdered sugar before slicing into squares. Garnish with fresh strawberries, raspberries, or mint leaves if desired. Serve at room temperature for the best flavor and texture.