01 - Heat oven to 350°F and grease a 9-by-13-inch pan. Whisk applesauce, sugar and oil, then add eggs one at a time and vanilla.
02 - Whisk flour, baking soda, cinnamon and salt separately. Fold into the wet mixture only until dry streaks disappear.
03 - Spread evenly in the pan. Bake about thirty to thirty-five minutes, extending as needed until the center is set and a tester has no raw batter.
04 - Cool in the pan before cutting. Cover only after steam has escaped so condensation does not wet the surface.