Place cream cheese in a medium mixing bowl; beat at medium speed of an electric mixer until smooth. Gradually add 1/4 cup sugar, beating well. Add egg, beating just until blended. Fold in lemon curd.
Prepare gingerbread batter according to package directions. Pour half of batter into a greased 8" square pan. Dollop lemon mixture over batter; pour remaining batter over lemon mixture. Swirl a knife through batter, touching bottom of pan and swirling to bring some lemon mixture to top of cake. Bake at 350° for 35 minutes or until knife inserted in center comes out clean. Cool in pan on a wire rack. Sift powdered sugar over cake.