This 4-Ingredient Lemon Buttercream Is So Good on Everything

This lemon buttercream frosting is what you make when vanilla frosting feels too boring. It’s bright, tangy, silky smooth, and comes together in about 10 minutes with just 4 ingredients.

Whether you’re frosting cupcakes, a layer cake, or a simple sheet cake, this easy dairy-free lemon buttercream adds bold citrus flavor without being too sweet or too heavy.

And the best part? A few small tricks make the texture perfectly spreadable and pipeable every time.

Why This Recipe for Lemon Buttercream Frosting?

Citrus lovers will fall for this frosting fast! The great thing about homemade lemon buttercream icing is that you can pair it with nearly any vanilla or fruit-flavored cake.

This recipe takes only ten minutes and four ingredients to make. You could probably get two of the ingredients from one or two lemons, too!

It makes enough to provide a basic layer of frosting for 2 sheet cakes or 24 cupcakes. If you want to pipe the frosting for extra decoration, you may need to double the recipe and use a good piping tool set. Of course, doubling the recipe isn’t that much harder if you want to go deluxe.

Equipment for Lemon Buttercream Frosting

If you do a lot of baking, especially with citrus fruit, you probably have most of these in your kitchen. Here’s what to set out before you get started:

• Mixing Bowl
• Handheld Electric Mixer (with Beaters)
• Plastic Spatula
• Lemon Zester
• Lemon Juicer

Key Ingredient Roles

These ingredients look almost deceptively simple, right? Let’s take a closer look!

Vegan Butter

1 cup vegan butter, softened

Vegan butter adds the fat needed to make this frosting luxuriously rich. No need to flinch at the word “fat” when you use the right kind of vegan butter, though. According to USDA FoodData Central, Earth Balance vegan butter sticks have 35.7 grams of heart-healthy monounsaturated fat per 100 grams.

The vegan butter should be softened but not melted for the best results. I typically handle this by letting it sit on the counter for a while before making the frosting.

Powdered Sugar

420 grams (about 4 cups) powdered sugar

Powdered sugar’s consistency makes it pretty versatile for making dessert toppings, ranging from simply sprinkling it on top to mixing it with butter to make frostings like this.

Lemon Zest

1 1/2 teaspoons lemon zest

Fresh lemon zest helps give this frosting its lemon flavor. You could buy dried lemon zest, but it’s not the same as using zest that’s just off the lemon.

How To Zest a Lemon

To zest your lemon, use the lemon zester to scrape off the yellow outer layer of the lemon peel. Try to avoid the bitter white part underneath.

Freshly Squeezed Lemon Juice

2-4 tablespoons lemon juice

Fresh lemon juice gives this frosting a better flavor than bottled lemon juice. I like to start by juicing the same lemon I just zested. Just cut it widthwise and juice both halves on your lemon juicer.

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Step-By-Step Instructions for Making Lemon Buttercream Frosting

Making this frosting is easier than you’d think. It just requires a bit of patience to get it to the right consistency.

Step One: Cream Butter

Place the softened vegan butter in your mixing bowl. Cream at low speed until it is light and fluffy.

Step Two: Sift In Half the Sugar

Sift about half the powdered sugar into the bowl with the creamed butter. The sifting part is important because it adds a bit of air to the powdered sugar. This helps with the frosting’s texture, making it just a little fluffier and easier to spread.

Step Three: Mix Butter and Sugar

Mix the butter and sugar on low speed until the sugar is evenly mixed in. Use a plastic spatula to scrape down the sides of the bowl as necessary.

Step Four: Sift and Mix in the Remaining Sugar

Finish sifting the sugar into the butter and mix on low speed until completely combined.

Step Five: Add Zest and 2 Tablespoons Lemon Juice

Add the lemon zest and 2 tablespoons of the lemon juice. Mix on low speed until evenly combined. If the frosting seems “thick” and not easy to spread, gradually mix in the remaining lemon juice until it is spreadable.

Step Six: Whip Until Frosting is Smooth

Increase the handheld mixer’s speed and whip until the frosting is smooth.

Step Seven: Frost Cake

Spread the frosting evenly on completely cooled cakes. Add decorations on top as desired. If you don’t need the frosting right away, cover the mixing bowl with plastic wrap and refrigerate it until you are ready to use it. It can be kept in the refrigerator for 5 to 7 days.

This frosting recipe makes enough for 2 9X13 sheet cakes. It can be scaled up or down, however you like. If you only need enough for one sheet cake, cut the recipe in half. Double it if you’re making enough cake for a good-sized party!

How To Frost A Cake

If you need guidance on frosting your cakes so they look as good as they taste, the video below offers some great tips.

Substitutions for This Lemon Buttercream Frosting Recipe

The vegan butter can be replaced with regular dairy butter if you can tolerate dairy products. I’ll generally use unsalted butter to avoid adding unnecessary salt to any recipe.

A real replacement for powdered sugar is difficult to find. However, if you run out of powdered sugar, you can get pretty close by running a little granulated sugar through a high-speed blender for about a minute.

There is no replacement for the fresh lemon zest and freshly squeezed lemon juice. However, if you want an orange-flavored buttercream frosting instead, you can substitute an equivalent amount of orange zest and freshly squeezed orange juice.

FAQs About This Lemon Buttercream Frosting Recipe

While this frosting is super simple to make, we do get questions! I tried to answer a few of the most commonly asked questions here. If you think of one we haven’t answered yet, feel free to ask in the comments section.

Can I make lemon buttercream frosting ahead of time?

You can make it up to 7 days in advance and store it in an airtight container in the refrigerator. Before using, let it come to room temperature and whip it again until smooth and fluffy.

If you need to store it for longer, keep it in the freezer for up to 2 months. Thaw it out in the fridge overnight, then bring it up to room temperature before using. Whip it before using.

How do I make lemon buttercream frosting thicker?

Gradually add 1 to 2 tablespoons of powdered sugar until it reaches your desired consistency. This is especially helpful if your frosting feels too soft for piping.

How do I make lemon buttercream frosting thinner?

Add a little more lemon juice, about 1 teaspoon at a time, and mix well after each addition. Stop once the frosting is smooth and spreadable.

Why is my lemon buttercream frosting grainy or lumpy?

This usually happens if the powdered sugar wasn’t sifted or the butter was too cold. Let the butter soften fully, sift the sugar, and beat the frosting longer until it becomes smooth. A “grainy” feel can also happen if you accidentally used granulated sugar instead of powdered sugar (though you might have noticed the difference when you tried to sift it).

Can you make frosting without a mixer?

Not really. To reach the right consistency and whip up the frosting, you need either a stand mixer or a handheld mixer.

Can this frosting recipe be doubled?

Yes, just make sure to use a large bowl so you’ll have plenty of room. Or you can just make 2 batches side by side.

Does this frosting recipe work for a sheet cake?

Yes, just cut the recipe in half if you are going to frost a 9″x13″ sheet cake. The full recipe makes enough for a 2-layer cake or a batch of 24 cupcakes.

Let Us Know How It Turned Out!

Did you make this lemon buttercream frosting? We’d love to hear how it went. Share your favorite cake pairing, any tips or variations you tried, and how you used it in the comments below. Your feedback may help inspire another baker, too.