Preheat your oven to 325°F (160°C).

Grease a 9x13-inch baking dish and set it aside.

In a mixing bowl, combine the cake mix, softened butter, and egg.

Stir until a thick, slightly dry dough forms.

Press the mixture evenly into the bottom of the greased pan using your hands or a spatula to create the crust layer.

In another bowl, mix together the cream cheese, eggs, and vanilla extract until smooth.

Set aside ¼ cup of powdered sugar for dusting later.

Gradually mix the remaining powdered sugar into the cream cheese mixture. Add it slowly while mixing continuously to avoid clumping or flying sugar dust.

Beat until smooth and creamy—this should take about 2–3 minutes.

Pour the cream cheese filling over the crust and spread it evenly.

Bake for 40 to 50 minutes. The center should be slightly jiggly, and the top will be puffed—don’t worry, it settles beautifully as it cools.

Allow the bars to cool completely in the pan.

Once cooled, sprinkle the reserved ¼ cup powdered sugar over the top.

Cut into squares and serve to friends and family—or just keep them all for yourself (we won’t judge).