Bean Paste Buttercream Recipe: Velvety-Smooth Frosting With Nutty Depth

This bean paste buttercream transforms ordinary desserts into decadent masterpieces—rich, velvety, and packed with nutty depth. 🌟 Unlike traditional buttercream, this plant-based version uses aquafaba and coconut oil for stability, while bean paste adds that signature umami richness that pairs perfectly with cakes, cupcakes, or cookies.

The secret lies in the slow whipping technique, which develops airiness without losing structure.

The beauty of this recipe is its versatility—it works for both piping and spreading, making it ideal for layering cakes or frosting sheet pans. Bean paste replaces butterfat while delivering a toasty, slightly sweet flavor that elevates even the simplest desserts.

For best results, chill the frosting before using to ensure clean, professional lines when decorating.

What sets this buttercream apart is its smooth yet sturdy texture—no graininess, no separation, and no need for dairy. The aquafaba provides the airy base, while the bean paste adds body and depth, creating a frosting that’s as elegant as it is easy to make.

Store it in the fridge for up to a week, or freeze for longer shelf life.

Perfect for vegan bakeries, allergy-friendly desserts, or anyone craving a nutty, creamy frosting without butter. The flavor profile works beautifully with chocolate, caramel, or even fruit-based desserts. Let’s get started on this game-changing recipe!

Ingredients for bean paste buttercream

Nine essential ingredients create this velvety bean paste buttercream—rich, stable, and dairy-free perfection.

The aquafaba is the secret to this buttercream's airy texture. Save the liquid from canned chickpeas—no need for fancy brands, but ensure it's chilled before using. Trader Joe's or Whole Foods sell chickpeas with high aquafaba yield. Bean paste should be unsweetened and smooth—look for brands like Miso Master or San Francisco-style in Asian markets. Coconut oil must be refined for neutral flavor; organic brands like Nutiva work well. Powdered sugar should be fine, sifted for smoothness—Domino or C&H are reliable choices. For vanilla, Madagascar bourbon extract adds depth without overpowering the nutty base.

No aquafaba? 1/4 cup aquafaba substitute (like 1 tbsp corn syrup + 1 tbsp water) works in a pinch, though texture won't be identical. Substitute bean paste with 1/2 cup tahini thinned with 1 tbsp water, but expect a slightly different flavor profile. Running low on coconut oil? Avocado oil or refined olive oil can replace it, though coconut's solidity at room temperature is ideal. Powdered sugar can be swapped for confectioners' sugar made from beet sugar for a neutral taste. Skip the xanthan gum? Add 1 extra tbsp cornstarch for stability, though results may vary. The lemon juice is non-negotiable—it prevents graininess and extends shelf life.

Store unused buttercream in an airtight container in the fridge for up to 1 week, or freeze for 3 months. For best piping results, let it sit at room temperature for 10 minutes before use. The frosting thickens when chilled, so rewhip briefly with a mixer if too stiff. Portion into small jars or piping bags for convenience. If graininess appears, strain through a fine-mesh sieve before using. This buttercream's versatility makes it perfect for decorating cakes, filling cupcakes, or even as a glaze for cookies—just adjust consistency with a splash of plant-based milk if needed.

Step-by-step instructions for bean paste buttercream

This method delivers professional-grade buttercream with nutty depth and velvety smoothness.

Measure the 1 cup Aquafaba into a clean, grease-free mixing bowl. Using a stand mixer fitted with the whisk attachment, beat on high speed for 5-7 minutes until stiff peaks form. You'll see the mixture thicken dramatically and hold its shape when the whisk is lifted—this is critical for stability.

I like to wipe the bowl with a damp cloth before starting to ensure no oil residue interferes with emulsification. If the aquafaba isn't chilled, let it sit in the fridge for 10 minutes before whipping—cold aquafaba whips faster and more reliably. Don't rush this step; under-whipped aquafaba leads to grainy buttercream.

In a small microwave-safe bowl, melt the 0.5 cup Coconut Oil in 20-second intervals, stirring between each, until completely liquid. The oil should be 100°F or slightly warmer when fully melted—hotter oil can scramble the aquafaba when combined.

Let the melted coconut oil cool for 5 minutes at room temperature. This gradual cooling prevents temperature shock when mixed with the aquafaba. You want it warm to the touch but not hot—think slightly cooler than body temperature. This step ensures your buttercream emulsifies smoothly without breaking.

With the mixer running on low speed, slowly drizzle the warm coconut oil into the whipped aquafaba. Add it in a thin, steady stream—about 1 tablespoon at a time—allowing each addition to fully incorporate before adding more. This gradual approach prevents the mixture from curdling.

Once fully combined, increase the speed to medium and whip for 2-3 minutes until the mixture lightens in color and becomes fluffy. Here's the thing—if the mixture looks curdled at this stage, don't panic. Simply add 1 teaspoon of lemon juice and whip for another 30 seconds. The acid helps stabilize the emulsion.

In a separate small bowl, whisk together the 0.5 cup Bean Paste, 3 cups Powdered Sugar, 1 tbsp Vanilla Extract, 0.25 tsp Salt, 1 tsp Cornstarch, and 0.25 tsp Xanthan Gum until completely smooth. The xanthan gum is key here—it acts as a vegan-friendly stabilizer that prevents the buttercream from separating.

With the mixer running on low speed, gradually add the dry mixture to the aquafaba-coconut oil base. Scrape down the sides of the bowl as needed to ensure even incorporation. Once fully combined, increase the speed to medium-high and whip for 4-5 minutes until the buttercream is light, fluffy, and reaches piping consistency.

For the ultimate test, pipe a small rosette onto parchment paper. If it holds its shape but still has a slight sheen, your buttercream is perfect. If it's too thick, add 1 teaspoon of lemon juice and whip for 30 seconds. If it's too thin, add 1 tablespoon of powdered sugar and whip until smooth.

Let the buttercream rest at room temperature for 10 minutes before using. This resting period allows the flavors to meld and the texture to fully set. The final product should be velvety-smooth with a rich, nutty depth from the bean paste—ideal for piping onto cakes or filling cupcakes. Store in an airtight container in the fridge for up to 5 days or freeze for 2 months.

Essential equipment for perfect results

Stand Mixer Essentials

A stand mixer with a whisk attachment is non-negotiable for this recipe. I recommend the KitchenAid Artisan Series for its durable motor and reliable performance—it handles the 5-7 minutes of high-speed whipping without overheating.

The whisk attachment should be clean and grease-free to prevent buttercream breakdown. For budget-friendly options, the Hamilton Beach 6-Speed Stand Mixer works well for smaller batches. 💡

Mixing Bowls

Use a medium-sized stainless steel bowl (at least 4-quart capacity) for whipping aquafaba—its smooth surface prevents sticking. I prefer OXO Good Grips bowls for their non-slip base and easy-to-clean design.

For the dry ingredients, a small glass bowl (like Pyrex) works best for mixing bean paste and powdered sugar smoothly. Avoid plastic bowls, as they can retain odors that affect flavor.

Measuring Tools

Precision matters here! Invest in a digital kitchen scale for accurate measurements of powdered sugar and bean paste—OXO Good Grips scales are my go-to. For liquids, a liquid measuring cup with clear markings ensures you get the exact 1 cup aquafaba and 0.5 cup coconut oil.

A fine-mesh sieve (like Microplane) helps sift powdered sugar for a silky texture. Don’t skip this step—grainy sugar ruins the final result. ✨

Thermometer

A candy or instant-read thermometer (like Thermoworks Thermapen) is crucial for monitoring coconut oil temperature—it should reach 100°F but not exceed 110°F to avoid scrambling the aquafaba. This small investment ensures your buttercream emulsifies perfectly every time.

If you’re melting oil in the microwave, pause every 20 seconds to check temperature and stir gently to prevent hot spots.

Piping Tools

For decorating, a piping bag with a star tip (like Wilton 1M) creates professional rosettes, while a round tip (Wilton 1A) works for borders. I also keep a small offset spatula handy for spreading frosting on cakes.

If you’re new to piping, practice on parchment paper first—this buttercream holds its shape beautifully when chilled. A pastry brush helps smooth any rough edges after piping. 🎨

Storage Containers

Store leftover buttercream in airtight glass containers (like Le Parfait jars) to maintain freshness. For easy access, portion into small silicone piping bags—they’re microwave-safe and reusable. Label containers with dates to track freshness.

If freezing, use freezer-safe plastic bags with 1 inch of headspace to prevent expansion cracks. Thaw overnight in the fridge before use. ❄️

Frequently asked questions