Funfetti Sheet Cake.

Soft and buttery vanilla sheet cake filled to the brim with sprinkles. Topped with my favorite creamy vanilla frosting and, as expected, more sprinkles.

Here’s a giant cake filled to the brim with sprinkles. It’s topped with sweet and creamy homemade vanilla frosting. It’s big enough to feed an army of sprinkle and cake and frosting lovers. Is there a better way to end a wonderful year??

Yes! Add more sprinkles on top.

Funfetti sheet cake is what dreams are made of. Let’s dig in.

I have to be honest, I made this funfetti cake back in October and have waited this long to share the recipe with you. Pumpkin, Thanksgiving, and Christmas cookies got in the way. Sorry? I did, however, make it again this past weekend to bring to some friends. Just as tasty as I remember.

Anyway. Having a loved sheet cake recipe in your baking repertoire is priceless. It’s a fun-filled cake that you can bring along to potlucks, office parties, birthday parties, and basically anywhere you need to feed a crowd some dessert. I’ve never made a funfetti sheet cake before, so this recipe was fun to play around with. The most important part about this cake recipe (and, well, any cake recipe) is having the correct size pan. I can’t tell you how many readers have contacted me about a cake recipe catastrophe. Only to find out they weren’t using the correct size pan. Whoops!

This sheet cake requires a 12×17 inch jelly roll/half sheet pan. I own 5 of these pans. They are DYNAMITE in the kitchen. I bake cookies on them, I cool toffee on them, roast vegetables on them, and I make sheet cakes in them. A fabulous multipurpose sheet pan is irreplaceable. Please, from one baker to another, get this pan. I am absolutely not associated with Calphalon. I’m just a huge supporter of quality baking sheets.

And a huge supporter of frosting. We’ll get to that in a minute.

Also important: using the right ingredients. Quite often, I hear about recipe disasters stemming from using substitutions. Like using margarine for butter, baking soda for baking powder (don’t do that! ever!), using almond flour for all-purpose, etc. Recipes that are developed with certain ingredients won’t turn out the same unless you’ve been testing and playing around with the recipe. I always suggest making the recipe as written first and then playing around with the recipe as you see fit. Some ingredients in some recipes shouldn’t be altered. And for this recipe? It’s pretty much all of them.

Every single ingredient plays a major roll in this thin cake’s texture, taste, and appearance. The butter and vanilla give the cake unbeatable vanilla cake flavor while creaming the butter and sugar give the cake its soft, cake-like texture. The two eggs tenderize and give structure while the whole milk leaves the cake moist. The yogurt (an acid) reacts with the baking soda to leaven the cake, and the flour is… well… everything. The only room for substitutions would be using sour cream instead of yogurt and other types of milk instead of whole milk. Please see my recipe notes for further details. If you’d like to leave the yogurt out all together, you’d have to sub in a different moist ingredient as well as use baking powder– and play around with that amount. And you’ll have a completely different tasting cake. What a headache. So, always follow a recipe.

On top of this buttery, sprinkle filled sheet cake is my classic vanilla frosting. My prized frosting, my favorite frosting! One of them, at least. There is just enough frosting to get that creamy extra sweetness in every bite, but not too much to take away from the fluffy cake hiding underneath. A fabulous cake to frosting ratio.

 The happiest cake for the happiest new year. 😀

Follow me on Instagram and tag #sallysbakingaddiction so I can see all the SBA recipes you make. ♥

Funfetti Sheet Cake

Yield: serves 25-30

Total Time: 1 hour, 45 minutes (includes cooling)

Soft and buttery vanilla sheet cake filled to the brim with sprinkles. Topped with my favorite creamy vanilla frosting and, as expected, more sprinkles. This recipe requires a 12x17 half sheet jelly roll pan.

Print Recipe

Ingredients:

• 1 cup (230g) unsalted butter, softened to room temperature


• 2 cups (400g) granulated sugar


• 2 large eggs, room temperature preferred


• 2 and 1/2 teaspoons vanilla extract


• 1/2 cup (120g) yogurt¹


• 2 and 1/4 cups (285g) all-purpose flour (measured correctly)


• 1 teaspoon baking soda


• 1/2 teaspoon salt


• 1 cup (240ml) whole milk²


• 1/2 cup (94g) rainbow sprinkles, plus more for decor³

Vanilla Frosting

• 3/4 cup (170g) unsalted butter, softened to room temperature


• 3 cups (360g) confectioners' sugar


• 2-3 Tablespoons (30-45ml) whole milk²


• 2 teaspoons vanilla extract


• 1/8 teaspoon salt

Directions:

1. Preheat oven to 350°F (177°C). Generously grease and lightly flour a 12x17 inch half sheet/jelly roll pan. Set aside.


2. In a large bowl using a hand-held mixer or stand mixer fitted with a paddle attachment, cream the softened butter for about 1 minute on medium speed. Get it nice and smooth, then add the sugar on medium speed and beat until fluffy and light in color. Beat in eggs and vanilla until smooth. You'll need to stop the mixer and scrape down the sides and up the bottom of the bowl to get it all mixed a couple times. Beat in the yogurt on medium high speed until combined.


3. In a large bowl, whisk the flour, baking soda, and salt together. Pour half of this flour mixture into the creamed butter mixture. Beat on low speed for 5 seconds. Pour in half of the milk. Beat on low speed for 5 seconds. Repeat with the rest of the flour and beat in the remainder of the milk until combined and smooth. Do not overmix. Using a large wooden spoon or rubber spatula, fold in the sprinkles. Sometimes I add up to 2/3 cup (125g) of sprinkles, but 1/2 cup is just fine. Nonsprinkle lovers may not like all 2/3 cup inside the cake!


4. Spread the cake batter into the prepared pan. Smooth it out into a thin, even layer with a rubber spatula. Bake for 20-24 minutes or until the top is lightly browned and a toothpick inserted in the center comes out clean. Make sure you rotate the cake pan once or twice during bake time if your oven has hot spots (mine does). Remove from the oven and allow the cake to cool in the pan on a wire rack. As the cake is cooling, make the frosting.


5. For the frosting: Using a hand-held mixer or stand mixer fitted with a paddle or whisk attachment, beat the butter on medium speed until creamy - about 2 minutes. Add confectioners' sugar, milk, vanilla extract, and salt with the mixer running on low. Increase to high speed and beat for 3 full minutes. Add more confectioners' sugar if frosting is too thin, more milk if frosting is too thick, or a pinch more of salt if frosting is way too sweet.


6. Spread frosting all over cooled cake, then top with sprinkles. Slice and serve. Cover leftovers tightly and store in the refrigerator for up to 5 days.

Make ahead tip: Cake can be made 1 day in advance, covered tightly at room temperature, and then frosted before serving. Frosting can also be made 1 day ahead of time-- cover tightly and keep in the refrigerator.

Recipe Notes:

1. Greek yogurt, regular yogurt, or sour cream are all OK. Do not use nonfat; I suggest full fat or low fat. I also suggest plain yogurt, though vanilla flavored is fine.


2. I highly recommend whole milk for the richest taste and moistest texture. 1% or higher milk fat is ok, as well as nondairy (low fat, not nonfat) milks. Whole milk (or even half-and-half or cream) is best in the frosting as well.


3. Here is where I buy my rainbow sprinkles in bulk. Do not use nonpareils (the little ball sprinkles) inside the cake batter. They will bleed! Please use rainbow sprinkles aka "jimmies." You can, however, decorate the frosting with nonpareils like I did in these photos. Always use a gentle hand when mixing sprinkles into a cake batter.

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Here’s my recipe for classic Homemade Funfetti Cupcakes

Here’s my recipe for a smaller Homemade Funfetti Cake

And, of course, Funfetti Sugar Cookie Cake.

Here’s your one stop shop for all things funfetti.

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