Stir together cake mix, 1 egg, and melted butter until combined; press mixture into a greased 13- x 9-inch pan. Sprinkle evenly with chocolate morsels and chopped pecans.
Beat remaining 2 eggs, powdered sugar, and cream cheese at medium speed with an electric mixer until smooth; spoon over crust mixture in pan. Bake at 325° for 35 to 40 minutes or until golden and bubbly. Cool completely in pan on a wire rack; cut into squares.
Tip: You can use a fine wire-mesh strainer to sift powdered sugar. Place a portion of powdered sugar at a time in strainer, and gently shake it back and forth.