Can You Use Buttercream and Cream Cheese Frosting on the Same Cake?

You’ve done it. You’ve baked the most tender, fragrant lemon cake layers imaginable. In one bowl, you have a silky, stable vanilla bean buttercream. In another, a tangy, luxurious cream cheese frosting just begging to be paired with fresh blueberries. The dream is to combine them—a sturdy, pipeable exterior with a soft, decadent filling. But then the fear creeps in: the dreaded frosting bulge.

We’ve all seen it. A beautiful layer cake that, after a few hours, starts to look a little… pudgy around the middle. The soft filling, under the weight of the cake layers above it, makes a slow-motion escape, pressing against the outer frosting and creating an unsightly bulge. It’s the baker’s equivalent of a foundation problem, and it can undermine your entire beautiful creation. The good news? The solution is simple, elegant, and rooted in a little bit of food science. You absolutely can, and should, use both frostings on the same cake. You just need to build a dam.

The Science of the Squeeze Why Buttercream and Cream Cheese Behave Differently

Before we build our dam, it’s crucial to understand why we need one in the first place. Baking is chemistry, and our two frostings have fundamentally different chemical structures. It all comes down to the primary fat and its relationship with water.

American Buttercream is, at its core, a fat-based system. Its stability comes from butter (and sometimes shortening), which is about 80% butterfat and only 15-18% water. When you beat butter with powdered sugar, you’re creating a stable emulsion where sugar crystals are suspended in a crystalline fat structure. When chilled, this fat becomes firm and solid, creating a frosting that holds sharp piped edges and can easily support the weight of a cake. Think of it as edible mortar.

Cream Cheese Frosting, on the other hand, is a different animal entirely. Its star ingredient, cream cheese, has a much higher water content (around 55%) and a softer, less structured fat and protein matrix. When you make cream cheese frosting, you’re creating a much looser emulsion. It’s deliciously tangy and soft, but that softness is its structural undoing. At room temperature, it has very little internal structure and behaves more like a thick paste than a solid. Piling cake layers on top of it is like building a house on sand—it’s bound to shift and squeeze outwards.

This is why a cake filled and frosted with only cream cheese frosting is often a simple, rustic affair or needs to be kept chilled right up until serving. To achieve those clean, sharp, professional-looking layers, we need to borrow the structural integrity of the buttercream.

The Buttercream Dam A Step-by-Step Engineering Guide

The buttercream dam is exactly what it sounds like: a sturdy ring of stiff buttercream piped around the edge of a cake layer. This ring acts as a retaining wall, holding the softer cream cheese filling securely in the center. It’s the technique professional bakers use every day to combine flavors and textures without compromising the cake’s structure.

Here’s how to execute it perfectly.

1. Achieve the Right Consistency Your dam needs to be built from a stiff consistency buttercream. If your primary buttercream is a softer meringue-based recipe, I recommend making a small, separate batch of sturdy American buttercream just for the dam. To get it right, your buttercream should be thick enough to hold a very sharp, defined peak when you pull a spatula away. If it’s too soft, simply beat in more powdered sugar, a tablespoon at a time, until you reach the desired stiffness. The ideal temperature for your butter when making this is around 67°F (19°C) — cool to the touch but still pliable.

2. Prepare Your Tools You’ll need a piping bag fitted with a large round tip. A Wilton 1A or an Ateco 804 is perfect for the job. Using a tip ensures a uniform, even ring of frosting. You can do it without a tip by just snipping the end off a piping bag, but a tip gives you far more control. A cake turntable will also make this process a breeze.

3. Pipe the Ring Place your first, completely cooled cake layer on your cake board or stand. Fill your piping bag with the stiff buttercream. Holding the bag straight up and down (at a 90-degree angle to the cake), pipe a continuous ring of frosting about 1/4-inch in from the outer edge of the cake. Make sure the ring is at least 1/2-inch high. This height will determine the thickness of your filling layer. Ensure there are no gaps in the ring!

4. The Chill (The Game-Changing Pro Tip) This is the step many home bakers miss, and it makes all the difference. Place the cake layer with its freshly piped dam into the refrigerator for 15-20 minutes. This will rapidly chill the fat in the buttercream, turning your soft ring into a truly firm, solid wall. It will be significantly more effective at holding back the filling.

5. Fill the Center Once the dam is firm, retrieve the cake layer from the fridge. Take your soft cream cheese frosting and spoon it into the center of the dam. Use a small offset spatula to gently spread the filling evenly, all the way to the inside edge of your buttercream wall. You should have a perfectly level surface.

6. Stack and Repeat Take your next cake layer and carefully place it on top. Gently press down on the center of the cake until the layer makes firm contact with the entire buttercream dam. The pressure is transferred to the sturdy dam, not the soft filling. Repeat the process—pipe a dam, chill it, fill it—for all subsequent layers. Once stacked, you can proceed with your crumb coat and final coat of frosting using your desired buttercream.

Recipe to Practice Lemon Blueberry Dream Cake

Here’s a complete recipe to put this technique into practice. The bright lemon cake, tangy blueberry filling, and stable vanilla buttercream are a match made in heaven.

For the Lemon Cake (Makes three 8-inch layers):

• 3 cups (360g) All-Purpose Flour (King Arthur is a great choice)
• 1.5 tsp Baking Powder
• 1 tsp Baking Soda
• 1 tsp Salt
• 1 cup (227g) Unsalted Butter, softened to 65°F (18°C)
• 2 cups (400g) Granulated Sugar
• 4 Large Eggs, room temperature
• 1 cup (240ml) Buttermilk, room temperature
• 1/2 cup (120ml) Fresh Lemon Juice
• Zest of 2 Large Lemons

Instructions: Preheat oven to 350°F (175°C). Grease and flour three 8-inch round cake pans. Whisk together flour, baking powder, baking soda, and salt. In a separate bowl, cream the butter and sugar until light and fluffy. Beat in eggs one at a time, followed by the lemon zest. In a third bowl, combine buttermilk and lemon juice (it will curdle; this is normal). Alternate adding the dry ingredients and the wet ingredients to the butter mixture, beginning and ending with the dry. Mix until just combined. Divide batter evenly among pans and bake for 25-30 minutes, or until a toothpick comes out clean. Let cool completely.

For the Stiff Vanilla Buttercream (For the Dam & Exterior):

• 1.5 cups (340g) Unsalted Butter, softened
• 1 cup (190g) High-Ratio Shortening (for stability)
• 8 cups (960g) Powdered Sugar, sifted
• 1/4 cup (60ml) Heavy Cream or Milk
• 2 tsp Vanilla Extract
• 1/4 tsp Salt

Instructions: In a stand mixer with the paddle attachment, beat the butter and shortening until smooth. Gradually add the powdered sugar, mixing on low speed until incorporated. Add the vanilla and salt. With the mixer on medium-high, slowly stream in the heavy cream and beat for 3-5 minutes until light, fluffy, and very stiff.

For the Blueberry Cream Cheese Filling:

• 1 cup (150g) Fresh or Frozen Blueberries
• 2 tbsp Granulated Sugar
• 1 tbsp Lemon Juice
• 16 oz (452g) Full-Fat, Block Cream Cheese (Philadelphia brand works best), softened
• 1 cup (113g) Unsalted Butter, softened
• 4 cups (480g) Powdered Sugar, sifted
• 1 tsp Vanilla Extract

Instructions: First, make the blueberry reduction. Combine blueberries, sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring occasionally, until the berries burst and the mixture thickens, about 10-15 minutes. Strain through a fine-mesh sieve to remove skins if desired. Let it cool COMPLETELY. In a stand mixer, beat the cream cheese and butter until smooth (do not overbeat). Add the sifted powdered sugar and mix on low. Add vanilla and the cooled blueberry reduction. Mix until just combined and smooth. This frosting will be noticeably softer than the buttercream.

Troubleshooting Your Frosting Foundation

Even with a solid plan, things can sometimes go sideways. Here’s how to fix common issues.

• The Problem: My dam still bulged!

  • The Cause: Your buttercream likely wasn’t stiff enough, you skipped the chilling step, or your kitchen is very warm. The butter in the frosting softened, compromising the dam.
  • The Fix: Next time, add an extra 1/2 cup of powdered sugar to your dam frosting. And never, ever skip the 15-minute chill. It’s the most important insurance policy for a straight cake.

• The Problem: My cream cheese filling is runny.

  • The Cause: This usually happens from over-whipping the cream cheese or using a low-fat or “spreadable” tub-style variety. These have more water and stabilizers that break down.
  • The Fix: Always use full-fat, block-style cream cheese. Beat it on its own just until smooth, then add the other ingredients. If your frosting is already runny, your best bet is to chill it for 30-60 minutes. This may help it firm up enough to use as a filling. Adding more powdered sugar can sometimes help, but it can also make it cloyingly sweet.

By understanding the unique properties of your ingredients, you can make them work for you, not against you. The buttercream dam isn’t a shortcut; it’s a smart technique that opens up a world of creative flavor combinations. Now you can confidently build the cake of your dreams, knowing its beauty is more than just skin deep—it’s structurally sound. (And incredibly delicious.)