Vanilla Mayonnaise Cake is a moist, tender dessert made without butter or oil. Mayonnaise adds richness and keeps the cake incredibly soft, while enhancing the vanilla flavor. Simple pantry ingredients come together in this easy, one-bowl recipe. Perfect for any occasion, it’s a surprising twist on classic vanilla cake that's quick to make and delicious with or without frosting.
Set the oven to 350°F (175°C). Lightly grease a 9×13-inch pan, and then line the bottoms with parchment paper so the cake doesn’t stick. Set them aside.
In a medium bowl, stir together the coconut flour, almond flour, xanthan gum, baking soda, baking powder, and salt. Break up any lumps as you go. Once everything’s combined, set the bowl aside.
In a larger bowl, whisk the mayonnaise, eggs, vanilla, and Gentle Sweet until the mixture is smooth. Slowly pour in the water while stirring until everything blends together evenly.
Add the dry ingredients to the wet mixture a little at a time. Stir by hand or use a mixer on low just until the batter is smooth. Let it sit for a few minutes so the coconut flour can soak up the moisture and thicken slightly.
Pour the batter into your prepared pan(s), spreading it out evenly. Bake for 30 to 35 minutes, or until a toothpick poked into the center comes out clean. Let the cake cool in the pan for 10 minutes, and then move it to a wire rack to finish cooling before adding any frosting or toppings.
Notes
Make sure to use a sugar substitute like THM Gentle Sweet that does not contain xylitol if you’re sensitive to it. For added flavor, try topping with a sugar-free cream cheese frosting or whipped cream. The xanthan gum helps bind the cake and gives it a better texture don’t skip it.