01 -
Preheat the oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving overhang on two sides for easy lifting.
02 -
Stir the cake mix, melted butter, and 1 egg in a medium bowl until a thick dough forms. Press it evenly into the bottom of the prepared pan.
03 -
In a large bowl, beat the softened cream cheese until smooth and lump-free. Scrape the bowl so the filling blends evenly.
04 -
Beat in 2 eggs, vanilla, and salt. Add the powdered sugar in 2 additions and mix on low at first, then medium, until creamy and smooth.
05 -
Spread the filling evenly over the crust. Bake for 38-42 minutes, until the edges are golden and the center still has a gentle wobble.
06 -
Cool completely in the pan. Lift out with parchment, dust with powdered sugar, and cut into 24 bars with a sharp knife wiped between cuts.