If you don’t have yellow cake mix, you could use pumpkin spice cake mix instead and reduce the spices in the filling, or make your own yellow cake mix.  To make your own, whisk together 2 ¼ cup all-purpose flour, 1 ½ cups granulated sugar, 3 ½ teaspoons baking powder and 1 teaspoon salt in a large bowl. Use a pastry cutter to blend in 4 tablespoons butter (½ stick).  Viola!  Now you have homemade yellow cake mix.