Baking Science: Which fat makes the best cake?I always use veg oil, and I always make an “extended and enhanced” recipe with a box mix, which used to include buttermilk in place of the water or milk, and I used sour cream. I tried Yoplait Vanilla Yogurt (smooth), and now I use half water/milk, oil, box of pudding mix, and a cup of yogurt … getting lots of praises. So moist.