Preheat your oven to 350°F. Grease a 9x13-inch baking pan lightly so the cake does not stick later. This helps keep layers neat and makes serving much easier.

In a mixing bowl, combine cake mix, one egg, and melted butter. Mix until a soft dough forms. Press this dough evenly into the prepared pan and smooth the surface.

In another bowl, beat softened cream cheese until smooth. Add pumpkin puree, eggs, melted butter, powdered sugar, vanilla, cinnamon, and nutmeg. Mix until creamy and thick.

Carefully pour the pumpkin mixture over the base layer. Spread it gently with a spatula so it covers evenly. This ensures each slice has balanced texture and flavor.

Place the pan in the oven and bake for about 40 to 45 minutes. The center should look slightly soft. Do not overbake because the gooey texture is the best part.

Remove the cake from the oven and let it cool completely in the pan. This step helps the filling set properly and makes slicing cleaner and easier.

Once cooled, cut into squares and serve. Enjoy at room temperature or chilled. The soft base and creamy pumpkin topping create a rich and comforting dessert.