This Mini Funfetti Cake is a classic Birthday Cake with Vanilla Frosting. This Small Batch Vanilla Cake is filled with Funfetti Sprinkles and is then topped with an easy small batch vanilla American Buttercream. This cake is baked in an Eighth sheet pan but can also be made in a loaf pan for the perfect small batch birthday cake!

Mini Funfetti Cake
Hi hi! I am just popping in to share the recipe for this mini funfetti cake! This is another mini sheet cake recipe - I posted this carrot one a wee way back, and I have a few more up my sleeve to post in the future.
This mini funfetti cake is the perfect small batch birthday cake. I scaled back my funfetti snack cake recipe to be a small batch recipe, and then baked in an eighth sheet pan. I then finished it off with a smooth vanilla American buttercream for that super nostalgic flavour. This mini funfetti cake is super cute and a lot of fun to make - I hope that you enjoy!
Components of Small Batch Birthday Cake
This mini funfetti cake is super easy to make and I just love how cute it is. There are only two components - the small batch vanilla cake with sprinkles, and then the small batch vanilla American buttercream topping the cake.
- Small Batch Vanilla Cake - This small batch funfetti cake is super easy to make. It comes together in two bowls and is quick to bake. I baked it in an eighth sheet pan which is my current favourite.
- Vanilla Bean American Buttercream Frosting - I kept things simple here. The vanilla american buttercream is super fluffy and the perfect vanilla flavour. It compliments the small batch funfetti cake in the most perfect way.
You can mix and match the cake with other frostings as you like - it would be super good with a raspberry frosting or this chocolate frosting!

How to bake in an Eighth Sheet Pan
I made this mini funfetti cake in an eighth sheet pan, which is half the size of a quarter sheet pan. They are super fun to bake in - I own a bunch. I love them for small batches of bread rolls, or also for mini sheet cakes such as this recipe. They line perfectly with quarter sheet pan sized parchment (one of my favourite things), and are just so, so cute. I use them all the time for toasting nuts or baking up a single cookie.
If you can't get hold of an eighth sheet pan, this mini funfetti cake will also work perfectly made in a 9"x5" (23x13cm) loaf pan. You will just need to watch the bake time!
Offsetting yellow in buttercream
If you use a good quality butter (like in NZ, all our butter is super yellow), you may end up with a buttercream with a slightly yellow tint to it. While there's absolutely nothing wrong with this, there is a way to fix it! Adding a teeny tiny drop of violet gel food colouring to the frosting offsets the yellow colouring. Sounds weird but it works. Same way blondes use a purple shampoo! It neutralises the yellow. Start with the teeniest bit on the end of a knife or spatula and see how you go.
Small Batch Vanilla American Buttercream
This mini funfetti cake is topped with a small batch american buttercream recipe. I am not usually a huge fan of american buttercream. It has a time and a place for sure though, and that time and place is on top of this cake!
American buttercream is super easy to make - I used a handheld electric mixer, but you could probably also make it by hand if you wanted if you whisked nice and hard. You want to look for a fluffy texture, so make sure you keep whipping until you get that.
My American buttercream recipe has milk in it - you can add as much as you like to soften it if you need. Remember that American buttercream is a crusting buttercream. This means that it will form a crust when exposed to the air, so if you have some in a bowl while you are working etc, pop some plastic wrap over it to prevent the crust from forming.
Best Sprinkles for Funfetti Cake
Not all sprinkles are equal when it comes to funfetti cake. You don't really want to use anything that bleeds colour in the oven as it will make the dough go brown.
Jimmies sprinkles work great in funfetti cake. They are little rainbow rods, and they don't tend to melt in the oven too badly, giving the perfect funfetti cake. I got mine from here, but the ones you can get in the grocery store are usually perfect!
You don't want to use anything naturally coloured or super fragile here - it will melt, and your cake will go a weird colour. Jimmies have stabiliser in them which stops them melting in the oven. DO NOT use non pareils / 100s and 1000s. It will be a shit show. If you're in New Zealand, these look like they might do the trick! I haven't tried them, but they look super similar to what I was using in the US!

Frequently Asked Questions for Mini Funfetti Cake
What pan did you bake this mini funfetti cake in?
I used an Eighth Sheet Pan. A loaf pan will also work! I got mine from Williams Sonoma but they don’t seem to stock them any more.
Can this be made in a mixer?
My stand mixer was too big for this small batch, so I used an electric hand mixer. However if yours can deal with a lower quantity, it should work!
Can this recipe be doubled?
Yes! You can either make it in an 8" square for more of a snack cake, or you can make it in a quarter sized sheet pan for a larger, thinner sheet cake.
Can this recipe be made ahead?
You can make the cake ahead of time and store lightly wrapped at room temperature. The frosting can be made ahead too - re-whip before assembly.
What can I use if I don't have greek yogurt?
Sour cream works great here too!

For more funfetti recipes, check out:
❤️ Made this recipe and love it? ❤️
I would LOVE for you to leave me a review and star rating below to let me know how you liked it! Also, please make sure to tag me on Instagram!
Answers to your baking questions
Over the years, many of you have asked me questions about:
- baking in grams
- adjusting oven temperatures
- what kind of salt to use
- and many more!
I've curated and answered them all for your easy reference in this frequently asked questions post!






















































































































































































































































































































































































































































