Single Layer Vanilla Bean Cake

Why You’ll Love This Recipe

I love this cake because it delivers everything I want from a classic vanilla cake in one easy layer. The crumb stays soft and tender, and real vanilla bean gives it a deeper, more fragrant flavor than vanilla extract alone.

I also like how easy this cake is to decorate. I can spread the frosting casually over the top, add fresh berries or sprinkles, and have a beautiful dessert without complicated cake decorating.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

For the vanilla bean cake:

• 1 1/2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon salt
• 1/2 cup unsalted butter, softened
• 3/4 cup granulated sugar
• 2 large eggs, room temperature
• 1 vanilla bean or 2 teaspoons vanilla bean paste
• 1 teaspoon vanilla extract
• 1/2 cup whole milk, room temperature
• 1/4 cup sour cream

For the vanilla frosting:

• 1/2 cup unsalted butter, softened
• 2 cups powdered sugar
• 1 vanilla bean or 1 teaspoon vanilla bean paste
• 1/2 teaspoon vanilla extract
• 2 to 3 tablespoons heavy cream or milk
• Pinch of salt

For decorating:

• Fresh berries, optional
• Sprinkles, optional

Directions

1. I preheat my oven to 350°F (175°C). I grease an 8-inch round cake pan and line the bottom with parchment paper.
2. I whisk the flour, baking powder, and salt together in a medium bowl.
3. I place the softened butter and granulated sugar in a large mixing bowl. I beat them together for about 2 to 3 minutes, until the mixture becomes pale and fluffy.
4. I add the eggs one at a time, mixing well after each addition.
5. If I’m using a vanilla bean, I split it lengthwise and scrape out the seeds. I add the seeds to the butter mixture along with the vanilla extract. If I’m using vanilla bean paste, I mix it in at this stage.
6. I combine the milk and sour cream in a separate bowl.
7. I gradually add the dry ingredients to the butter mixture, alternating with the milk mixture. I begin and end with the dry ingredients and mix only until everything is combined.
8. I transfer the batter to my prepared cake pan and smooth the surface.
9. I bake for about 28 to 33 minutes, or until the center springs back lightly and a toothpick inserted into the middle comes out clean or with a few moist crumbs.
10. I let the cake cool in the pan for about 10 minutes before carefully transferring it to a wire rack.
11. I let the cake cool completely before frosting it.
12. To make the frosting, I beat the softened butter until creamy. I gradually add the powdered sugar and continue beating until combined.
13. I add the vanilla bean seeds or vanilla bean paste, vanilla extract, salt, and 2 tablespoons of cream. I beat the frosting until light and fluffy, adding a little more cream if I need a softer consistency.
14. I spread the frosting generously over the top of my cooled cake. I can leave the sides exposed for a simple single-layer presentation.
15. I finish the cake with fresh berries or sprinkles if desired, then slice and serve.

Servings and Timing

This recipe makes one 8-inch round cake and approximately 8 servings.

• Prep time: 20 minutes
• Cook time: 28–33 minutes
• Cooling time: About 45 minutes
• Decorating time: 10 minutes
• Total time: About 1 hour 45 minutes
• Servings: 8

I make sure the cake is completely cool before adding the buttercream. If the cake is still warm, the frosting can soften or melt.

Variations

For a Vanilla Berry Cake, I decorate the frosting with strawberries, raspberries, blueberries, or a combination of fresh berries. I love the contrast between the sweet vanilla cake and slightly tart fruit.

For a Lemon Vanilla Bean Cake, I add finely grated lemon zest to the batter. I can also add a small amount of lemon juice to the frosting for a brighter citrus flavor.

When I want a fun birthday version, I fold colorful sprinkles into the batter and add more over the frosting.

For a Chocolate Vanilla Bean Cake, I scatter mini chocolate chips through the batter or drizzle melted chocolate over the finished frosting.

I can also replace the vanilla buttercream with cream cheese frosting, strawberry frosting, chocolate buttercream, or whipped cream when I want to change the overall flavor.

Storage/Reheating

I store the frosted cake covered at room temperature for up to 2 days if my kitchen is cool. For longer storage, I refrigerate it in an airtight container for up to 5 days.

When I refrigerate the cake, I prefer letting individual slices sit at room temperature for about 20 to 30 minutes before serving. This allows the butter and frosting to soften and gives me the best texture.

For longer storage, I freeze unfrosted cake for up to 2 months. I wrap the completely cooled cake tightly and place it in a freezer-safe container. I thaw it before adding fresh frosting.

I don’t usually reheat this cake. I find that serving it at room temperature gives me the softest crumb and best vanilla flavor.

FAQs

Can I use vanilla extract instead of a vanilla bean?

Yes. If I don’t have a vanilla bean or vanilla bean paste, I can use good-quality pure vanilla extract. I usually increase the amount slightly because vanilla bean has a particularly concentrated and aromatic flavor.

What is the difference between vanilla bean paste and vanilla extract?

I find vanilla bean paste thicker and more concentrated, and it usually contains visible vanilla bean seeds. It gives my cake those characteristic little vanilla flecks. Vanilla extract works well too, but it doesn’t create quite the same appearance or flavor intensity.

Why is my vanilla cake dry?

I avoid overbaking the cake and measure my flour carefully. I also use room-temperature milk, eggs, and sour cream so the batter combines smoothly. I start checking the cake before the maximum baking time.

Can I make Single Layer Vanilla Bean Cake ahead of time?

Yes. I can bake the cake a day ahead, cool it completely, and keep it tightly wrapped. I can also prepare the frosting separately and decorate the cake closer to serving.

Can I bake this cake in a different pan?

Yes. I can use a 9-inch round pan, although the cake will be slightly thinner and may bake more quickly. I start checking it earlier whenever I change the pan size.

Conclusion

Single Layer Vanilla Bean Cake is one of my favorite choices when I want a classic homemade cake without the work of stacking and decorating multiple layers. The tender buttery crumb and fragrant vanilla bean flavor make a simple cake feel special.

Single Layer Vanilla Bean Cake

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Single Layer Vanilla Bean Cake is soft, buttery, and fragrant with real vanilla bean flavor. Fluffy vanilla frosting makes this simple one-layer cake perfect for birthdays, small celebrations, or an everyday dessert.

• Author: Laura
• Prep Time: 20 minutes
• Cook Time: 28–33 minutes
• Total Time: About 1 hour 45 minutes
• Yield: 1 8-inch cake, 8 servings
• Category: Dessert
• Method: Bake
• Cuisine: American
• Diet: Vegetarian

Ingredients

• 1 1/2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon salt
• 1/2 cup unsalted butter, softened
• 3/4 cup granulated sugar
• 2 large eggs, room temperature
• 1 vanilla bean or 2 teaspoons vanilla bean paste
• 1 teaspoon vanilla extract
• 1/2 cup whole milk, room temperature
• 1/4 cup sour cream
• 1/2 cup unsalted butter, softened
• 2 cups powdered sugar
• 1 vanilla bean or 1 teaspoon vanilla bean paste
• 1/2 teaspoon vanilla extract
• 2 to 3 tablespoons heavy cream or milk
• Pinch of salt
• Fresh berries, optional
• Sprinkles, optional

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Instructions

1. Preheat the oven to 350°F (175°C). Grease an 8-inch round cake pan and line the bottom with parchment paper.
2. Whisk the flour, baking powder, and salt together in a medium bowl.
3. Beat the softened butter and granulated sugar for 2 to 3 minutes until pale and fluffy.
4. Add the eggs one at a time, mixing well after each addition.
5. Split the vanilla bean lengthwise and scrape out the seeds. Add the seeds and vanilla extract to the butter mixture. If using vanilla bean paste, add it with the vanilla extract.
6. Combine the milk and sour cream in a separate bowl.
7. Gradually add the dry ingredients to the butter mixture, alternating with the milk mixture. Begin and end with the dry ingredients and mix only until combined.
8. Transfer the batter to the prepared pan and smooth the surface.
9. Bake for 28 to 33 minutes, or until the center springs back lightly and a toothpick inserted into the middle comes out clean or with a few moist crumbs.
10. Cool the cake in the pan for 10 minutes, then carefully transfer it to a wire rack and cool completely.
11. For the frosting, beat the softened butter until creamy, then gradually beat in the powdered sugar.
12. Add the vanilla bean seeds or vanilla bean paste, vanilla extract, salt, and 2 tablespoons of cream. Beat until light and fluffy, adding additional cream as needed.
13. Spread the frosting generously over the top of the completely cooled cake.
14. Decorate with fresh berries or sprinkles if desired, then slice and serve.

Notes

• Make sure the cake is completely cool before frosting so the buttercream does not soften or melt.
• If vanilla beans or vanilla bean paste are unavailable, good-quality pure vanilla extract can be used instead.
• For a lemon variation, add finely grated lemon zest to the batter and a little lemon juice to the frosting.
• For a birthday version, fold colorful sprinkles into the batter and decorate the frosting with additional sprinkles.
• A 9-inch round pan can be used, but the thinner cake may bake more quickly.
• Store the frosted cake covered at room temperature for up to 2 days in a cool kitchen or refrigerate for up to 5 days.
• Unfrosted cake can be tightly wrapped and frozen for up to 2 months.

Nutrition

• Serving Size: 1 slice
• Calories: 490 kcal
• Sugar: 44 g
• Sodium: 210 mg
• Fat: 25 g
• Saturated Fat: 15 g
• Unsaturated Fat: 8 g
• Trans Fat: 0.5 g
• Carbohydrates: 62 g
• Fiber: 1 g
• Protein: 5 g
• Cholesterol: 105 mg