The Best Vanilla Sheet Cake Recipe – Sugar & Sparrow

Sometimes you just want a delicious vanilla cake without all the hassle of decorating a tall, layered masterpiece. This vanilla sheet cake is exactly what you need! It’s wonderfully moist and airy, packed with classic vanilla flavor. To top it off, a smooth vanilla buttercream and colorful rainbow sprinkles make it perfect for any celebration. Plus, it’s so quick and easy to decorate! Growing up, birthday sheet cakes were the star of many family gatherings, and honestly, they’re my go-to when I need a simple cake that feeds a crowd without fuss.

If you’re a vanilla cake fan but want to skip the time-consuming step of stacking layers, this vanilla sheet cake is your new best friend. The batter is based on my favorite vanilla cupcake recipe that always comes out moist, light, and bursting with vanilla goodness. Baked in a simple 9×13 pan, it’s an easy way to serve a bunch of people, whether it’s a party, potluck, or just a weekend treat.

Right here, you’ll find everything laid out just so: ingredient details with helpful swaps, clear step-by-step instructions with suggested timing, photos to guide you, and smart tips to make sure your cake turns out beautifully. I also share tricks for decorating, storing, prepping ahead, and fixing common issues. What’s great about this vanilla sheet cake is how versatile it is—whether you keep it simple with sprinkles or add your own twists, it’s dependable and fast!

• What’s included: notes on ingredients and alternatives, a full and clear method, buttercream recipe, and tips for decorating and carrying your cake safely.
• Who it’s for: anyone who loves a great vanilla cake that’s easy to whip up and decorate without the fuss of multiple layers.
• What to expect: a tender cake rich with vanilla flavor that’s easy to make and relaxing to decorate.

What Makes It So Special

Here’s why I’m totally smitten with this vanilla sheet cake, and why I think you will love it too:

• Super Moist and Fluffy. This cake starts with my perfect vanilla cupcake batter, a recipe I trust for great texture. Thanks to cake flour and a bit of extra sugar, the crumb is extra soft and light. Plus, a touch of sour cream and just the right amount of whole milk keeps it wonderfully moist without being heavy.
• Rich Vanilla Flavor. I pack in a full tablespoon of pure vanilla extract to make that comforting vanilla flavor shine through beautifully!
• Easy to Prepare. You don’t need fancy tools—just a hand mixer or stand mixer works fine. I’ve broken the process down with timing tips so you can breeze through making the cake. It’s as straightforward as many of my favorite cake recipes.
• Fun and Forgiving to Decorate. Unlike layered cakes, sheet cakes give you plenty of room to play without worrying about perfect tiers. You can keep the frosting simple or get creative with piping and decorations — whatever suits your mood and schedule!
• Easiest to Transport. Because you bake it and frost it right in the pan, it’s super simple to cover and take wherever you’re headed. No extra containers needed!

Ingredients and Smart Substitutions

• 2 1/2 Cups (265g) sifted cake flour* DIY recipe in notes
• 2 tsp baking powder
• 1/2 tsp baking soda
• 1 tsp salt
• 3/4 Cup (170g) unsalted butter, softened to room temperature
• 1 3/4 Cup (340g) granulated white sugar
• 3 large eggs, room temperature
• 1/2 Cup (120g) sour cream, room temperature
• 1 Tbsp pure vanilla extract
• 1 Cup (240ml) whole milk, room temperature
• 1 1/2 Cups (339g) unsalted butter, room temperature
• 5 Cups (600g) powdered sugar
• 1 Tbsp pure vanilla extract
• 3 Tbsp whole milk, room temperature
• pinch of salt, or to taste
• 1/4 Cup rainbow sprinkles

How to Bake and Assemble

1. Bring eggs, butter, sour cream, and milk to room temperature.
2. Preheat oven to 325°F (163°C).
3. Spray the sides of a 9×13 metal baking pan with baking spray and line the bottom with parchment paper.
4. Sift cake flour, then spoon and level into the cup for accuracy.
5. Whisk together sifted cake flour, baking powder, baking soda, and salt; set aside.
6. Beat softened unsalted butter on high for about 2 minutes until creamy.
7. Add granulated sugar and beat an additional 2 minutes until light and fluffy, scraping the bowl occasionally.
8. Add the eggs one at a time, mixing 10–15 seconds after each addition.
9. Mix in vanilla extract and sour cream on high for 1 minute.
10. Turn off the mixer, add the dry ingredients all at once, and mix on low just until they begin to come together.
11. Slowly pour in the whole milk while mixing on low until just combined; scrape the bowl and stir gently by hand to remove any lumps.
12. Pour the batter into the prepared pan and smooth the top.

13. Bake for 30–35 minutes, until the cake springs back lightly and a toothpick inserted in the center comes out clean.

14. Allow the cake to cool completely in the pan to room temperature before frosting.
15. Cream unsalted butter on medium-high speed until pale and fluffy, about 7 minutes, to make the buttercream.
16. Add powdered sugar gradually (a couple cups at a time) and mix on low, scraping down the sides and paddle often, until fully incorporated.
17. Stir in vanilla, milk, and a pinch of salt, then mix on low until the buttercream is smooth.
18. Spread half of the buttercream over the cooled cake with a spatula to create a rustic textured layer.
19. Fill a piping bag with the remaining buttercream fitted with a Wilton Tip 4B and pipe a shell border around the edges.
20. Finish with rainbow sprinkles, if desired.

Pro Tips for Perfect Results

Here are some easy tips that really make a difference when baking this vanilla sheet cake:

• Bring all your ingredients—eggs, butter, sour cream, and milk—to room temperature. Cold ingredients don’t mix as smoothly and won’t trap as much air, which affects texture.
• If you can, weigh your flour instead of scooping by volume. The recipe uses sifted cake flour by volume, but if you DIY your cake flour using all-purpose, follow my notes carefully to get the grams right.
• Don’t overmix your batter once you add the dry ingredients. Stir just until combined, then add the milk slowly. Overmixing develops gluten and can make the cake tough, which no one wants!
• Use a metal 9×13 pan for the best and most consistent results. Glass or dark colored pans tend to bake faster, so check your cake 5 to 10 minutes early if you’re using one of those.
• Wait until the cake is fully cooled before frosting. If it’s even a little warm, your buttercream will melt and slide right off.
• If you only have salted butter, skip the salt in the recipe and taste your buttercream before adding any extra salt.
• When you’re piping the border, chill your piping bag for a few minutes if the buttercream feels too soft—this helps it hold its shape.

Flavor Ideas and Mix-Ins

Want to mix things up a bit? These simple tweaks work perfectly with this vanilla sheet cake base:

• Vanilla Bean. Swap the 1 tablespoon vanilla extract for 1 to 2 teaspoons of vanilla bean paste or the seeds from one real vanilla bean. You get those pretty little specks and an even deeper vanilla flavor.
• Lemon Vanilla. Add 1 to 2 teaspoons of fresh lemon zest to the batter, and swap 1 tablespoon of milk in the buttercream for lemon juice. The result is a bright, fresh twist on classic vanilla.
• Almond Variation. Replace 1 teaspoon of vanilla extract with 1/2 to 1 teaspoon almond extract, but use sparingly since almond extract is quite strong. It lends a lovely subtle nuttiness.
• Berry Topped. Before frosting, spread a thin layer of fruit jam or fresh berry compote on the cake. If you want to use fresh berries as a topping, add them right before serving so they stay fresh.
• Taller Cake or Party Layers. Double this recipe to bake two separate 9×13 cake layers (or two 8 or 9-inch round pans) if you want a taller cake with filling between the layers instead of just a sheet cake.
• Decorating Swaps. Play with colored buttercream, sprinkle just on the border, or drizzle a simple chocolate glaze instead of using all the buttercream for a different look and flavor.

How to Store and Make Ahead

Here’s how to keep your vanilla sheet cake fresh, plan ahead, and handle leftovers so your cake always tastes great:

• Unfrosted Cake: After it cools completely, wrap it tightly in plastic wrap—press a piece of wrap right against the surface to keep it moist—and store it at room temperature for up to two days. For longer storage, wrap it again in foil and freeze for up to two months. Thaw fully before frosting.
• Frosted Cake: Keep your assembled cake covered at room temperature and it will stay good for up to five days. This keeps the cake moist and protects decorations. If it’s hot or humid, refrigerate the frosted cake; just bring it back to room temperature 1 to 2 hours before serving so the frosting softens.
• Buttercream: Keep buttercream in an airtight container at room temperature for up to one day, or in the fridge for up to two weeks. If refrigerated, bring it back to room temp and whip it again before using to get it spreadable.
• Freezing & Thawing: For the best texture, freeze the unfrosted cake layers. Thaw them overnight in the fridge, then bring to room temp before frosting. You can freeze a frosted cake for short periods, but be aware decorations and sprinkles may lose shape once thawed.
• Reheating Slices: Warm a single unfrosted slice in the microwave for 10-20 seconds or in a 300°F oven for 5-8 minutes covered with foil. Avoid reheating frosted slices if you want to keep that perfect buttercream texture.

Common Questions and Troubleshooting

• Do I sift the flour before or after measuring? For this vanilla sheet cake, sift your flour before measuring. Using a kitchen scale makes this even easier—you can sift your flour directly into the bowl on the scale to get a perfect amount without extra scooping or leveling.
• What if I don’t have cake flour? Cake flour gives this cake its soft, airy texture, so I really do recommend grabbing some if you can. If not, you can make your own version at home using all-purpose flour. Check the notes above for my DIY cake flour method—it’s simple and works well when you can’t find the real thing.
• How tall is this vanilla sheet cake? The baked cake layer is about 1.5 inches tall, with the sides a little lower. Add the frosting, which adds another half inch or so, and each slice ends up about 2 inches tall. If you want a taller cake with layers or filling in between, double the recipe and bake two layers separately rather than stacking a single thicker cake.