Mom's Best Recipes
Recipe

Peanut Butter Frosting

Fluffy, creamy, not-too-fussy peanut butter frosting that spreads smoothly and pipes beautifully.

Author By Matt Campbell
4.8
A glass bowl of fluffy peanut butter frosting with a smooth swirl on top, sitting on a light kitchen counter
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Peanut butter frosting is one of those shortcuts to instant joy. It is sweet, salty, and cozy all at once, and it turns basically anything into a treat that disappears fast. This version is creamy, fluffy, and easy to tweak depending on whether you want it thicker for piping or looser for swooping onto brownies with reckless abandon.

I keep the ingredients simple and the steps low drama, because frosting should feel like the fun part. Taste as you go, adjust the salt, and do not be surprised if a spoon “accidentally” goes missing.

Measured ingredients for peanut butter frosting including peanut butter, powdered sugar, butter, vanilla extract, and milk arranged on a clean kitchen counter

Why It Works

  • Big peanut butter flavor: Creamy peanut butter brings salty-sweet depth without needing anything fancy.
  • Fluffy texture that holds: Beating the butter and peanut butter first builds a light base, then powdered sugar makes it stable.
  • Easy consistency control: A splash of milk loosens it for spreading, more sugar firms it for piping.
  • Friendly with tons of desserts: Cupcakes, sheet cakes, brownies, sandwich cookies, even graham crackers in a pinch.

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Storage Tips

Refrigerator: Store frosting in an airtight container for up to 3 to 5 days. It will firm up when cold. Let it sit at room temperature 20 to 30 minutes, then re-whip for 30 to 60 seconds to bring back the fluff.

Freezer: Freeze in a sealed container for up to 2 months. Thaw overnight in the fridge, then let it warm slightly and re-whip.

On frosted desserts: If your cake or cupcakes are frosted, cover and refrigerate if your kitchen is warm. Let slices come to room temperature before serving for the best texture.

Common Questions

Can I use natural peanut butter?

You can, but it is a little unpredictable. Natural peanut butter can separate and make frosting look oily or feel loose. If you use it, stir it extremely well first, then expect to add a bit more powdered sugar to tighten it up. For the smoothest, most consistent frosting, commercial creamy peanut butter is the easy win.

How do I make it thicker for piping?

Skip the extra milk at first. If it still feels soft, add more powdered sugar 2 to 3 tablespoons at a time. You want it to hold a stiff peak: when you lift the beater or spatula, the tip stands up instead of drooping. Chilling the frosting for 10 to 15 minutes also helps it hold its shape.

How do I make it less sweet?

Frosting is always going to be sweet, but you can balance it. Start with an extra pinch of salt, then taste. If you want a deeper, less sugary vibe, add 1 to 2 tablespoons unsweetened cocoa powder (sifted) or swap in a tangier frosting style like a peanut butter cream cheese version. A small splash of milk or cream can make it feel less intense by loosening the texture a bit, but salt and cocoa do the heavy lifting on sweetness.

Why is my frosting grainy?

Usually it is powdered sugar not fully incorporated. Sift the powdered sugar next time, and beat a little longer on medium. Also make sure your butter is truly at room temperature and soft.

Can I make this chocolate peanut butter frosting?

Yes. Add 1/3 cup unsweetened cocoa powder (sifted) and an extra 1 to 2 tablespoons milk as needed.

Does this recipe double well?

Yes. Double it in a stand mixer bowl and give yourself a little extra mixing time. You may need an additional tablespoon or two of milk or cream to dial in the texture.

When I was learning my way around kitchens, I realized pretty quickly that frosting is the great equalizer. A slightly overbaked cupcake becomes “on purpose” the second you crown it with something creamy. Peanut butter frosting is my favorite for that. It is forgiving, it tastes like comfort, and it makes you look like you planned ahead even if you absolutely did not.