Moist One-Bowl Vanilla Layer Cake
Everyone needs one reliable vanilla cake, and this is mine. It is soft, genuinely moist, and comes together in a single bowl — no creaming stage, no stand mixer required. It is the cake I make for birthdays when I want something classic that always works.
The secret to the tender crumb is a mix of butter for flavour and oil for moisture, plus buttermilk for softness. Pile it with vanilla buttercream and you have a proper celebration cake.
If chocolate is more your thing, try my easy one-bowl chocolate cake, or go fruity with the lemon blueberry loaf.
Why this recipe works
Using both butter and oil gives you the best of both — butter for flavour, oil for a crumb that stays moist for days. Buttermilk adds tenderness and a subtle tang, while its acidity works with the baking soda for a light rise. Mixing in one bowl keeps it simple without sacrificing texture.
What you'll need
Standard cake ingredients, nothing fancy:
- Buttermilk: key for a tender crumb. No buttermilk? Add 1 tbsp lemon juice to milk and rest 5 minutes.
- Butter and oil: both, for flavour and lasting moisture.
- Vanilla: use a good extract — it is the headline flavour here.
Smart swaps: no buttermilk? Make your own with milk and lemon juice. All butter works if you prefer, though the cake is slightly less moist. Cake flour gives an even softer crumb if you have it.
Moist One-Bowl Vanilla Layer Cake
Moist one-bowl vanilla cake with buttercream. Serves 12.
Ingredients
- ½ cup (113 g) unsalted butter, softened
- ½ cup (120 ml) neutral oil
- 1¾ cups (350 g) granulated sugar
- 4 large eggs
- 1 tbsp vanilla extract
- 3 cups (360 g) all-purpose flour
- 2½ tsp baking powder
- ½ tsp baking soda
- 1 cup (240 ml) buttermilk
- For frosting: 1 cup (227 g) butter + 4 cups (480 g) powdered sugar
Method
- Heat oven to 175°C / 350°F. Grease and line two 20cm (8-inch) round tins.
- In one bowl, whisk the softened butter, oil and sugar until combined, then whisk in the eggs and vanilla.
- Add the flour, baking powder and soda alternately with the buttermilk, mixing just until smooth.
- Divide between the tins and bake 28–32 minutes, until a skewer comes out clean.
- Cool in the tins 10 minutes, then turn out onto a rack to cool completely.
- For the frosting, beat the butter until pale, add powdered sugar, a splash of milk and vanilla, and whip until fluffy.
- Fill and frost the cooled cakes.
Step by step
Step 1 — Mix in one bowl
Whisk the butter, oil and sugar together, then the eggs and vanilla. Adding the dry ingredients alternately with the buttermilk keeps the batter smooth and avoids over-mixing.
Step 2 — Bake and cool fully
Divide evenly and bake until a skewer comes out clean. Let the layers cool completely before frosting or the buttercream will melt.
Step 3 — Frost
Whip the buttercream until light, then fill and coat the cooled cake. A crumb coat first, chilled briefly, gives the cleanest finish.
Pro tips
- Weigh your flour. 360 g keeps the cake tender; too much makes it dry.
- Room-temp eggs and buttermilk blend more evenly for a better rise.
- Do not over-mix. Stop as soon as the batter is smooth to keep it soft.
- Cool completely before frosting. Warm cake melts buttercream.
- Level the layers with a serrated knife for a stable, tidy cake.
Storage & make-ahead
Keep the frosted cake covered at room temperature for up to 2 days, or refrigerate for up to 5 (bring to room temperature before serving). Unfrosted layers freeze well for up to 3 months — wrap tightly, thaw, then frost. You can also bake the layers a day ahead and frost on the day.
Variations & substitutions
- Funfetti: fold in ⅓ cup sprinkles for a birthday cake.
- Lemon: add lemon zest to the batter and frosting.
- Cupcakes: bake as cupcakes for 18–20 minutes (makes about 24).
- Smaller cake: use the ½x scaler for a single-layer cake.
Frequently asked questions
Why is my cake dry?
Usually too much flour or over-baking. Weigh the flour and check a few minutes early with a skewer.
Can I make it without buttermilk?
Yes — stir 1 tbsp lemon juice into 1 cup milk and rest 5 minutes for a quick substitute.
Can I bake it as one tall cake?
Yes, in a deeper tin, but add 10–15 minutes and tent with foil if it browns too fast.
Can I make it ahead?
Bake the layers a day ahead or freeze them; frost on the day for the freshest result.
Final thoughts: this is the vanilla cake to learn by heart — reliable, moist, and endlessly adaptable for any celebration. Bake it, make it your own, and tell me what you top it with over on the contact page.
For more on the butter-plus-oil method, King Arthur Baking explains the science nicely.
About Alishba
I'm a self-taught home cook who writes recipes the honest way — refined until they genuinely work, with no shortcuts and no fake awards. More recipes by Alishba →
