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Creamy Peanut Butter Buttercream Frosting

Smooth, Bakery-Style Peanut Butter Frosting for Cakes & Cupcakes

I made this on a random Tuesday because I had half a jar of peanut butter sitting in the pantry and honestly? I haven’t stopped thinking about it since.

My husband walked into the kitchen, saw me standing at the counter with a spoon, and just laughed. He didn’t even ask. He grabbed his own spoon.

This peanut butter frosting is dangerously smooth. The kind of creamy that makes you forget you were supposed to be frosting a cake and not just eating it straight from the bowl.

It’s rich, but not heavy. Sweet, but the peanut butter keeps it grounded. And that glossy swirl? Absolutely perfect on chocolate cupcakes, brownies, layer cakes, or honestly… a graham cracker at midnight.

My mom used to make something similar for my birthday cakes when I was little, and the second I tasted this, I was right back in her kitchen.

That’s the kind of frosting this is.

Perfect for:

• Chocolate cake with peanut butter frosting
• Peanut butter cupcake icing
• Homemade buttercream frosting
• Brownie frosting ideas
• Birthday cake frosting
• Easy dessert toppings

Why This Peanut Butter Frosting Works

This frosting hits the perfect balance:

• Butter creates structure and fluffiness
• Peanut butter adds richness and depth
• Powdered sugar provides sweetness and stability
• Cream makes it silky and pipeable

Beating it well incorporates air, creating that light, bakery-style buttercream texture that spreads beautifully and pipes clean swirls.

It’s sturdy enough for layer cakes but soft enough for spreading with a knife.

Equipment You’ll Need

• Large mixing bowl
• Electric hand mixer or stand mixer
• Rubber spatula
• Measuring cups and spoons
• Piping bag and tips (optional)

Ingredients

• 1 cup (2 sticks) unsalted butter, softened to room temperature
• ¾ cup creamy peanut butter
• 2–3 cups powdered sugar (start with 2, add more as needed)
• 1 teaspoon vanilla extract
• 2–3 tablespoons heavy cream or milk (if needed)

Ingredient Notes

Butter
Must be fully softened to whip properly. Cold butter will cause lumps.

Creamy Peanut Butter
Use standard creamy peanut butter for smooth texture. Natural peanut butter can separate and change consistency.

Powdered Sugar
Controls thickness and sweetness. Add gradually to reach desired texture.

Heavy Cream
Creates that fluffy, pipeable buttercream finish.

Step-by-Step Instructions

Step 1: Whip the Butter

In a large bowl, beat softened butter for about 2 minutes until light and fluffy.

This builds the foundation for a smooth frosting.

Step 2: Add Peanut Butter

Add peanut butter and beat until completely smooth and creamy.

Scrape down the sides as needed.

Step 3: Add Vanilla

Mix in vanilla extract.

Step 4: Add Powdered Sugar

Gradually add powdered sugar one cup at a time.

Beat on low until incorporated, then increase to medium-high.

Continue adding sugar until desired thickness is reached.

Step 5: Adjust Consistency

If frosting feels too thick:

Add heavy cream or milk one tablespoon at a time.

If too thin:

Add a little more powdered sugar.

Step 6: Final Whip

Beat on high for 1 minute until silky, fluffy, and glossy.

Ready to spread or pipe.

Pro Tips for Perfect Buttercream

• Use room temperature ingredients
• Beat butter alone first for best fluffiness
• Sift powdered sugar for ultra-smooth texture
• For extra stability, chill 10 minutes before piping
• Add a pinch of salt to balance sweetness

Best Ways to Use This Frosting

• Chocolate layer cake
• Vanilla cupcakes
• Brownies
• Sheet cake
• Peanut butter chocolate cake
• Sandwich cookies

Storage

Refrigerate in airtight container up to 5 days.

Bring to room temperature and re-whip before using.

Freeze up to 2 months.

Frequently Asked Questions

Can I make this ahead of time?

Yes. Store in fridge and re-whip before using.

Can I pipe decorations with this?

Yes. It holds shape well for swirls and borders.

Can I use natural peanut butter?

Not recommended — texture may become oily or separated.