Simple Vanilla Cake with Creamy Vanilla Buttercream

There are afternoons when a plain slice of cake is exactly right: soft crumb, buttery edges, and a clean vanilla flavor that needs no occasion. This simple vanilla cake is baked in one rectangular pan and topped with a swipe of creamy vanilla buttercream. The batter comes together with a whisk and a bowl, so there is no need to stack layers or pull out a mixer for the cake itself.

It is an easy birthday cake, a potluck dessert, or something to cut into small squares and keep on the counter for coffee. If you want individual portions for a party, these classic vanilla cupcakes with buttercream make a festive companion.

Why You'll Love This Simple Vanilla Cake

This cake stays tender for a few days because butter, milk, and eggs make a moist crumb without making it heavy. Vanilla is the main flavor, so use a good extract and measure it generously. The sheet-pan format bakes evenly and cuts neatly, and the frosting is an uncomplicated American buttercream that spreads in minutes.

You can dress it up with sprinkles and berries or leave it plain with a little powdered sugar. Its mild sweetness also makes it a handy base for seasonal fruit. For a darker, cocoa-rich dessert on the same table, add slices of Texas chocolate sheet cake.

Ingredients

• 2 1/2 cups all-purpose flour, spooned into the measuring cup and leveled
• 1 3/4 cups granulated sugar
• 2 teaspoons baking powder
• 1/2 teaspoon fine salt
• 3/4 cup unsalted butter, melted and cooled for 10 minutes
• 3 large eggs, at room temperature
• 1 cup whole milk, at room temperature
• 2 tablespoons vanilla extract
• 1/4 teaspoon almond extract, optional
• For the frosting: 1 cup unsalted butter, softened; 3 1/2 cups powdered sugar; 2 tablespoons milk or cream; 2 teaspoons vanilla extract; and a pinch of salt
• Sprinkles, berries, or extra powdered sugar, optional

Butter and eggs at room temperature blend more easily into the batter. If you forgot to take them out, set the eggs in warm tap water for 10 minutes and warm the milk gently in the microwave. The melted butter should feel warm, not hot, before it meets the eggs.

How to Make a Simple Vanilla Cake

1. Prepare the pan. Heat the oven to 350°F. Grease a 9-by-13-inch metal baking pan and line the bottom with parchment if you plan to lift out the whole cake. Leave the parchment long enough to make two handles. If you are serving directly from the pan, greasing and flouring it is enough.
2. Combine the dry ingredients. In a large bowl, whisk together the flour, sugar, baking powder, and salt for about 30 seconds. This distributes the leavener and prevents little salty or bitter pockets in the finished cake.
3. Mix the wet ingredients. In a second bowl, whisk the melted butter, eggs, milk, vanilla, and almond extract if using. Whisk until the eggs are completely blended and the mixture looks smooth. The butter may look slightly separated at first; it will come together when mixed with the flour.
4. Make the batter. Pour the wet mixture into the dry ingredients. Whisk just until no large dry patches remain, then switch to a spatula and scrape around the bottom of the bowl. A few small lumps are fine. Stop mixing as soon as the flour disappears, since extra mixing can make the cake chewy.
5. Bake until set. Scrape the batter into the pan and level the surface. Bake on the center rack for 30 to 35 minutes. Start checking at 28 minutes; the cake is done when the center springs back lightly and a toothpick comes out with a few moist crumbs but no wet batter. If you use a glass pan, it may need a few extra minutes.
6. Cool completely. Set the pan on a rack for 15 minutes, then run a thin knife around the edges. Leave the cake in the pan until fully cool, about 1 hour. Frosting a warm cake will melt the buttercream and pull crumbs into it.
7. Make the buttercream. Beat the softened butter in a bowl for 2 minutes until pale and creamy. Add the powdered sugar in three additions on low speed, mixing well after each. Beat in the milk, vanilla, and salt, then increase the speed to medium for 1 minute. If it seems stiff, add milk 1 teaspoon at a time; if loose, add a little powdered sugar.
8. Frost and serve. Spread the buttercream over the cooled cake with an offset spatula or the back of a spoon. Add sprinkles or berries if you like, then slice into 12 to 16 squares. A spoonful of fresh homemade whipped cream and fruit makes each serving feel a little more special.

Tips and Easy Variations

Measure flour lightly

Too much flour is the quickest path to a dry cake. Spoon flour into the cup rather than dipping the cup into the bag, then level it with a straight edge. If you have a kitchen scale, weigh about 300 grams for the 2 1/2 cups. Mix only until combined and take the cake out as soon as the center is set.

Change the flavor gently

• Lemon vanilla: Add 1 tablespoon finely grated lemon zest to the sugar and rub it between your fingers before whisking in the other dry ingredients.
• Funfetti: Fold 1/3 cup rainbow jimmies into the finished batter. Avoid nonpareils, which can bleed color.
• Berry-topped: Frost the cake, then arrange sliced strawberries or raspberries on top just before serving. For another easy fruit dessert, try this warm blueberry cobbler.
• Almond-vanilla: Use the optional almond extract and finish with toasted sliced almonds. Start with the listed amount; almond extract can take over quickly.

For a two-layer birthday cake, divide the batter between two greased 8-inch round pans and begin checking around 22 minutes. The layers will be thinner and cool faster. Keep the frosting amount as written for a light layer between the cakes and a modest coat on top; double it for a thick, fully covered finish.

Raw batter is tempting to taste, but flour and eggs can carry germs before baking. Skip licking the spoon and bake the cake fully; the FDA explains the risks of raw dough and batter.

Storage and Reheating

Keep the frosted cake covered at cool room temperature for up to 2 days if the kitchen is not warm. For a longer window, refrigerate it in an airtight container for up to 5 days. Let slices sit at room temperature for 20 to 30 minutes before serving so the buttercream softens. There is no need to reheat the cake, though a plain slice can be warmed for 8 to 10 seconds in the microwave if you like it slightly warm.

To freeze, cut the unfrosted cake into portions, wrap each piece tightly, and store in a freezer bag for up to 2 months. Thaw wrapped slices on the counter for an hour or overnight in the refrigerator. Frost after thawing for the freshest texture. Buttercream can also be made 3 days ahead and refrigerated; let it soften, then beat briefly before spreading.

Simple Vanilla Cake FAQ

Can I make this simple vanilla cake without a mixer?

Yes. The cake batter is mixed by hand with a whisk and spatula. A hand mixer makes the buttercream faster, but you can beat the softened butter with a sturdy wooden spoon and add the sugar gradually.

Why did my vanilla cake turn out dense?

Dense cake usually means the batter was overmixed, the baking powder is old, or the flour was packed into the measuring cup. Check that your baking powder is active, spoon and level the flour, and stop as soon as the batter is combined.

Can I use oil instead of butter?

You can replace the melted butter in the cake with 2/3 cup neutral oil. The crumb will stay soft but have less buttery flavor. Keep butter in the frosting, since it gives the buttercream its structure.

Can I bake the cake in a round pan?

Yes. Divide the batter between two greased 8-inch round pans and bake for about 22 to 27 minutes, checking early. Let the layers cool fully before removing and frosting them.

How do I keep the frosting smooth?

Use softened butter, add the powdered sugar gradually, and scrape the bowl once or twice. If the frosting feels grainy, beat it for another minute. Add milk a teaspoon at a time so it loosens without becoming runny.