How to Fill and Stack a Layer Cake

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Today I’m sharing my tutorial for how to fill and stack a cake! If you’ve ever had trouble with a cake that slides around or wobbles, this tutorial is for you! You’ll never wonder how to make a layer cake again!

How to Make a Layer Cake

With so many cake recipes on my site, I find that wobbly, unstable cakes can often be a problem for people. While it can seem like there’s an issue with the recipe, it’s often just that there are a few simple tips that would make all the difference. I talked a couple days ago about the importance of leveling and torting your cakes. Today we’ll chat about filling your cake and the first thing we need to talk about is frosting.

Frosting Consistency is Key

My standard vanilla buttercream recipe is the base of the majority of the frostings I use when layering cakes. I even use it as I begin to create different flavors. I go into more depth about the frosting itself in that post, if you’re interested in giving that a read. The most important thing to note is the ratios of ingredients. It’s easy to assume that adjustments to those ratios won’t make a difference, but it does.

Having the right frosting consistency is key to a successful layered cake. You can also check out that post for more information, but what you should really focus on here is again all about ratios. The base of your frosting is more than likely going to be butter/shortening. To that you’re going to be adding powdered sugar and some sort of liquid ingredient or flavoring. Ultimately the consistency of your frosting is determined by the amount of liquid you use, which thins out the frosting, compared to the powdered sugar, which thickens it.

For your cake to not slip around, the frosting needs enough powdered sugar to make the frosting stable. It might be surprising how much powdered sugar is needed in a truly stable frosting, but it’s necessary in an American buttercream. As much as you might be tempted to reduce the powdered sugar, if you’re making a layered cake with a thin filling, you’re going to want to be very careful about how much you adjust it.

In my post about frosting consistency, I show a few images of what to look for to make sure your frosting is the consistency you’ll need, so check that out if you aren’t sure.

What You’ll Need to Make a Layer Cake:

Cake layers (of course)
Offset spatula (I prefer the 9 inch)
Piping bag
Large round piping tip (I use Ateco 808)
Frosting
Filling
Turntable
Cardboard cake round
Cake lifter, optional

How To Fill and Stack a Cake

I used a cake with a few different kinds of filling in one cake so that I could show this a few ways, so let’s take a look.

If you’re just adding a layer of buttercream between your cake layers, your frosting can have a thinner consistency and hold together just fine. I tend to add about 1 cup of frosting between my 8 inch cake layers and spread it into an even layer. You want to be sure it’s nice and even/level. One of the keys to a cake that doesn’t wobble is even layers.

For this cake, I was adding two fillings in one so I started with just 1/2 a cup of frosting. Add your frosting to your cake layer and spread evenly, allowing some to hang over the edges of the cake.

adding buttercream filling
evenly spreading buttercream filling

The next thing being added is a layer of caramel sauce. To keep it from spilling out from between the cake layers and creating a wobbly cake, we’ll add a dam of frosting around the outer edge of the cake. In this case, it’ll also be on top of the first layer of frosting. Again, this is where the consistency of your frosting is key. In order for things to stay in place, that dam of frosting needs to be firm enough. I like to pipe my dam so that it goes right up against the edge of the cake, potentially with a little bit of it hanging over the edge.

Another thing to keep in mind is the amount of filling you add. I mentioned above that I use about a cup of buttercream, but when it comes to thinner fillings I tend to stick with 1/2 to 3/4 cup, depending on how thin it is. No matter how strong your buttercream is, if the filling is quite thin and too tall, you’ll still end up with a wobbly cake.

I also like to be sure to add a dam that has plenty of height, so that I’m sure that all my filling will fit within it. This is where I use my large round piping tip for that height. After you’ve added your dam by piping it around the edge of your cake, add your filling and spread it into an even layer.

piping a buttercream dam onto cake
a buttercream dam
adding filling to a dam, with a dam

Before adding the next layer of cake, make sure that your filling layer is level. If your dam is taller than your filling (which mine usually is), use your offset spatula to go around the outer edge/the dam and smooth out the frosting so that it’s level with the filling.

leveling out the dam of a cake
filling of a cake with a leveled dam

Add your next layer of cake. I like to use my cake lifter for thinner cake layers to make sure they don’t break apart.

adding another layer of cake

The next steps are really just variations of above. I add another dam and fill it with chocolate ganache and a crunchy streusel. Again, it’s a tall dam that evens up needing to be leveled off before adding the next layer of cake.

piping a dam onto a cake layer
filing a dam with chocolate ganache
adding a crumble filling
leveling out the dam with offset spatula

Once you’ve stacked and filled all your cake layers, your cake should look something like below. There’s a fair amount of frosting hanging over the sides. I use this frosting to spread around the outside and top of my cake to create the crumb coat. The crumb coat is a thin layer of frosting on the outside of a cake that holds in the crumbs so that they don’t mix into your final layer of frosting. You could always add frosting to the cake for the crumb coat, but I find that having the frosting in the filling layers already spread out to the edges actually helps to eliminate air bubbles, which can get caught in the frosting and work their way out, giving your cake a very un-lovely “pimple”.

a stacked cake with three fillings
adding a crumb coat
cake with a crumb coat

Once you’ve got your crumb coat, you are ready to frost your cake. If needed, you can refrigerate your cake prior to frosting it. I’ve got a terrific tutorial for frosting a smooth cake with buttercream you should check out. It includes a step-by-step video where I walk you through the process.

I hope you found today’s post helpful! I haven’t actually shared the cake I showed above yet (but it’s coming!), so here’s a quick look at the inside so you can see how the filling layers turned out.

layered cake slice

Some cake recipes with yummy fillings to try:

Brown Sugar Layer Cake with Peach Filling
Lemon Cake with Lemon Bavarian Cream
Berry Mascarpone Layer Cake
Pina Colada Layer Cake
Almond Custard Cake
Raspberry Chocolate Layer Cake
Banana Cream Layer Cake
Pecan Pie Layer Cake
Hot Chocolate Cake