Meet your new go-to party dessert: a soft, buttery vanilla sheet cake that bakes up beautifully in one pan. It’s tender, moist, and loaded with real vanilla flavor. No stacking, no stress—just a gorgeous, crowd-pleasing cake you can frost right in the pan and slice for a happy crowd.

I love this cake because it delivers bakery-level texture without fancy tools. You’ll use simple pantry ingredients, a reliable mixing method, and a creamy vanilla buttercream that spreads like a dream. Make it for birthdays, potlucks, office celebrations—any time you want a classic cake that never disappoints.

Why This Vanilla Sheet Cake Recipe Works

All-purpose flour + cornstarch emulate cake flour to keep the crumb light and soft.
Room-temperature ingredients help the batter emulsify for an even, tender bake.
Buttermilk adds moisture and a subtle tang that balances sweetness and improves texture.
Two types of vanilla (extract + paste) give deep, true vanilla flavor that stands out.
Creaming method traps air in the batter for lift without dryness.
Sheet pan simplicity means even baking, easy transport, and quick frosting.

Ingredients

For the Vanilla Sheet Cake

2 1/2 cups (300g) all-purpose flour
1/4 cup (30g) cornstarch
2 1/2 tsp baking powder
1/2 tsp baking soda
3/4 tsp fine sea salt
1 cup (226g) unsalted butter, room temperature
1 3/4 cups (350g) granulated sugar
4 large eggs, room temperature
2 tsp pure vanilla extract
1 tsp vanilla bean paste (optional but recommended)
1 cup (240ml) buttermilk, room temperature
1/4 cup (60ml) neutral oil (such as canola or vegetable, for extra moisture)

For the Vanilla Buttercream

1 cup (226g) unsalted butter, room temperature
3 1/2 cups (420g) powdered sugar, sifted
2–3 tbsp heavy cream or milk
2 tsp pure vanilla extract
1/4 tsp fine sea salt
Sprinkles for finishing (optional)

How to Make This Easy Vanilla Sheet Cake

Before You Start

Preheat oven to 350°F (177°C). Grease a 9×13-inch metal baking pan and line with parchment, leaving overhang for easy lifting.
Bring butter, eggs, and buttermilk to room temperature for 45–60 minutes.

Make the Batter

Whisk dry ingredients: In a medium bowl, whisk flour, cornstarch, baking powder, baking soda, and salt until evenly combined.
Cream butter and sugar: In a large bowl or stand mixer, beat butter and sugar on medium-high for 3–4 minutes until pale and fluffy. Scrape the bowl.
Add eggs: Beat in the eggs one at a time, mixing well after each. Add vanilla extract and vanilla paste; mix until smooth.
Combine wet ingredients: Stir the buttermilk and oil together in a measuring cup.
Alternate dry and wet: On low speed, add the dry ingredients in three additions, alternating with the buttermilk mixture in two additions, beginning and ending with dry. Mix just until the flour disappears. Do not overmix.
Pan and bake: Spread batter evenly in the prepared pan. Tap the pan once on the counter to settle. Bake for 28–34 minutes, until the center springs back and a toothpick comes out with a few moist crumbs.
Cool completely in the pan on a rack for 1–2 hours before frosting.

Make the Frosting

Beat the butter on medium-high until creamy, about 1–2 minutes.
Add powdered sugar, 1 cup at a time, mixing on low to incorporate. Add vanilla and salt.
Drizzle in 2 tbsp cream and beat on medium-high for 2 minutes until fluffy. Add the last tablespoon of cream if you want a softer spread.
Spread frosting generously over the cooled cake. Add sprinkles if you like. Slice and serve.

How to Store Vanilla Sheet Cake

Room temperature: Keep frosted cake covered at cool room temp for 1–2 days.
Refrigerator: Store slices in an airtight container for up to 5 days. Bring to room temp before serving for best texture.
Freezer: Wrap unfrosted cake tightly in plastic, then foil, and freeze for up to 2 months. Thaw in the fridge overnight, then frost.
Make-ahead frosting: Refrigerate buttercream for up to 1 week or freeze for 1 month. Let it come to room temp and re-whip with a splash of cream.

Benefits of Making a Vanilla Sheet Cake for Parties

Feeds a crowd without stacking or fancy decorating.
Travel-friendly because it stays in the pan.
Fast to frost with one batch of buttercream and a handful of sprinkles.
Customizable for any theme—colors, candies, piping, or writing on top.
Consistent results thanks to even heat in a 9×13 pan.
Classic flavor everyone loves—vanilla hits the nostalgic birthday note.

What Not to Do

Don’t skip room temperature ingredients. Cold eggs and butter create a dense, uneven crumb.
Don’t overmix after adding flour. Mix just until combined to avoid toughness.
Don’t overbake. Pull the cake when a few moist crumbs cling to the tester.
Don’t frost a warm cake. Warm cake melts buttercream and ruins the finish.
Don’t use dark glass pans without adjusting. They brown faster; start checking for doneness 3–5 minutes early.

Variations You Can Try

Funfetti Sheet Cake: Fold in 1/2 cup rainbow jimmies to the batter. Use extra sprinkles on top.
Lemon-Vanilla: Add 1 tbsp lemon zest to the sugar before creaming and swap 2 tbsp buttermilk with fresh lemon juice.
Strawberry Frosting: Beat in 1/4 cup freeze-dried strawberry powder to the buttercream.
Almond Twist: Replace 1 tsp vanilla with 1 tsp almond extract and top with toasted sliced almonds.
Coconut Topping: Stir 1 cup toasted coconut into the frosting for texture.
Chocolate Glaze: Skip buttercream and pour a shiny ganache (8 oz chocolate + 3/4 cup hot cream) over the cooled cake.

FAQ

Can I use cake flour instead of all-purpose + cornstarch?

Yes. Use 2 3/4 cups (275g) cake flour and omit the cornstarch.

What if I don’t have buttermilk?

Mix 1 cup milk with 1 tbsp white vinegar or lemon juice. Let it sit for 5 minutes, then use.

Can I bake this as cupcakes?

Yes. Fill liners 2/3 full and bake at 350°F for 18–22 minutes. Yields about 24 cupcakes.

How do I make it gluten-free?

Use a 1:1 gluten-free baking flour with xanthan gum. Expect a slightly different crumb but great results.

Does this cake hold up under decorations?

Yes. It handles simple piping, sprinkles, and writing well. Keep heavy toppers minimal since it’s a soft crumb.

Can I double the recipe for a larger pan?

Double for an 18×13-inch sheet pan and bake 22–28 minutes, checking early.

Why did my cake sink in the middle?

You likely underbaked, opened the oven door early, or overmixed the batter. Bake until the center springs back and avoid peeking before 20 minutes.

Conclusion

This vanilla sheet cake brings everything you want for a party: ease, reliability, and that nostalgic, buttery vanilla bite. Mix it up in one bowl, bake in a trusty 9×13, and frost generously. The crumb stays tender, the flavor shines, and the slices disappear fast—which is exactly the goal. Save this recipe for every birthday and big gathering. It never lets you down.

Easy Vanilla Sheet Cake Recipe | Soft Homemade Birthday Cake for Parties

A soft, buttery vanilla sheet cake with real vanilla flavor, baked in a 9x13 pan and topped with creamy vanilla buttercream. Perfect for birthdays and parties with simple pantry ingredients and effortless frosting.

Print Recipe Pin Recipe

Prep Time 30

Cook Time 32

Total Time 2 2

Servings 12 slices

Ingredients

2 1/2 cups (300g) all-purpose flour
1/4 cup (30g) cornstarch
2 1/2 tsp baking powder
1/2 tsp baking soda
3/4 tsp fine sea salt
1 cup (226g) unsalted butter, room temperature
1 3/4 cups (350g) granulated sugar
4 large eggs, room temperature
2 tsp pure vanilla extract
1 tsp vanilla bean paste (optional but recommended)
1 cup (240ml) buttermilk, room temperature
1/4 cup (60ml) neutral oil (such as canola or vegetable)
1 cup (226g) unsalted butter, room temperature (for frosting)
3 1/2 cups (420g) powdered sugar, sifted
2–3 tbsp heavy cream or milk
2 tsp pure vanilla extract (for frosting)
1/4 tsp fine sea salt (for frosting)
Sprinkles for finishing (optional)

Instructions

Preheat the oven to 350°F (177°C). Grease a 9x13-inch metal baking pan and line it with parchment, leaving overhang.
Bring the butter, eggs, and buttermilk to room temperature.
In a medium bowl, whisk together the flour, cornstarch, baking powder, baking soda, and salt until evenly combined.
In a large bowl or stand mixer, beat the butter and granulated sugar on medium-high until pale and fluffy, 3–4 minutes, scraping the bowl as needed.
Beat in the eggs one at a time, mixing well after each addition, then mix in the vanilla extract and vanilla bean paste.
Stir the buttermilk and oil together in a measuring cup.
On low speed, add the dry ingredients in three additions, alternating with the buttermilk-oil mixture in two additions, beginning and ending with dry, mixing just until the flour disappears.
Spread the batter evenly in the prepared pan, tap once on the counter to settle, and bake until the center springs back and a toothpick comes out with a few moist crumbs, 28–34 minutes.
Cool the cake completely in the pan on a rack for 1–2 hours before frosting.
For the frosting, beat the butter on medium-high until creamy, 1–2 minutes.
Add the powdered sugar 1 cup at a time, mixing on low to incorporate, then add vanilla and salt.
Drizzle in 2 tablespoons cream and beat on medium-high for about 2 minutes until fluffy, adding the remaining tablespoon of cream if a softer spread is desired.
Spread the frosting generously over the cooled cake, add sprinkles if using, slice, and serve.

Notes

Store frosted cake covered at cool room temperature for 1–2 days, or refrigerate slices up to 5 days and bring to room temperature before serving. Freeze unfrosted cake tightly wrapped for up to 2 months; thaw in the fridge overnight before frosting. For funfetti, fold 1/2 cup rainbow jimmies into the batter. For lemon-vanilla, add 1 tbsp lemon zest and swap 2 tbsp buttermilk with lemon juice. For strawberry frosting, beat in 1/4 cup freeze-dried strawberry powder. For almond, replace 1 tsp vanilla with 1 tsp almond extract and top with toasted almonds. Cupcake option: bake at 350°F for 18–22 minutes, about 24 cupcakes.