Prepare cake batter according to package directions. Pour into a lightly greased 13- x 9-inch pan.
Stir together sugar and next 3 ingredients; pour over batter (it will sink to bottom of pan). Do not stir.
Bake at 350° for 45 minutes. Let stand 10 minutes. Serve with vanilla ice cream and chopped pecans.
Find recipes with ingredients that you have on hand.