These decadent Keto Chocolate Cupcakes with Peanut Butter Frosting are rich, fluffy, and topped with silky smooth peanut butter goodness. They’re the perfect treat for birthdays, parties, or whenever chocolate cravings strike.

❤️ Why You’ll Love These Keto Chocolate Cupcakes with Peanut Butter Frosting

• Same decadent flavors as the beloved Reece’s peanut butter cups
• Smooth and creamy peanut butter frosting
• Moist and perfectly fluffy rich chocolate cupcakes
• Perfect for birthday parties
• Gluten free and kid friendly

There’s something about chocolate and peanut butter together that never gets old. These Keto Chocolate Cupcakes bring those perfect Reece’s flavors to life in the best low-carb and gluten free cupcakes. With every bite, you get soft, rich chocolate topped with creamy peanut butter frosting.

I’ve made these cupcakes for birthdays, potlucks, and even for those random sweet tooth attacks, and they always hit the spot. Even though they are naturally gluten free and keto friendly, they are always a big hit with kids and adults alike. If you love peanut butter cups, this recipe is for you!

Craving more peanut butter and chocolate treats? Be sure to try these homemade Keto Peanut Butter Cups and Peanut Butter Chocolate Fudge.

🛒 Ingredients for Chocolate Peanut Butter Cupcakes

• 1 batch Keto Chocolate Cupcakes
• 1 batch Keto Peanut Butter Frosting

*Exact measurements are listed in the recipe card below.

🥣 Recommended Tools

• Mixing bowls
• Hand mixer
• Whisk
• Ice cream scoop
• Muffin pan
• Cupcake liners
• Piping bag

🔪 How to Make Chocolate Keto Cupcakes with Peanut Butter Frosting

To Make the Chocolate Cupcakes

Preheat oven to 350°F.

Add the dry ingredients to a mixing bowl.

Whisk until well combined, then set aside.

In a separate bowl, add in the wet ingredients.

Mix until combined, using a hand mixer. Add the dry ingredients in and continue mixing, just until combined, but don’t over mix.

Using an ice cream scoop, divide the batter into 12 cupcake liners in a muffin pan.

Bake for 18-20 minutes or until a toothpick, when inserted, comes out clean. Set them aside to cool completely while you make the frosting.

To Make the Peanut Butter Frosting

Add the mascarpone cheese, butter, sweetener and heavy cream into a mixing bowl and whip using a hand mixer.

Add in the peanut butter and vanilla extract, then continue mixing until well combined. Add more heavy cream if needed to get your desired consistency.

Add the frosting to a piping bag fitted with the tip of your choice.

Once the cupcakes have cooled completely, pipe the frosting onto each cupcake.

I chose to top the cupcakes with some sugar-free peanut butter cups, but this is optional. You can add chopped peanuts, a drizzle of peanut butter, chocolate sauce or cocoa powder. You can also serve them plain, since they will have plenty of great flavor as is!

☑️ Storage Instructions

Store your cupcakes in an airtight container up to 5 days.

You can also freezer them. Start by freezing them uncovered on a tray until solid, then wrap individually in plastic wrap and store in a freezer bag.

Thaw in the fridge overnight, still wrapped, then let them sit at room temperature unwrapped so condensation doesn’t form on the frosting.

💡 Tips

• Use room temperature eggs so the batter mixes smoothly.
• Sift the dry ingredients for a lighter, fluffier cupcake texture.
• Let the cupcakes cool completely before frosting to keep it from melting.
• Use a cookie scoop to evenly portion the batter into the cupcake liners.
• Don’t overmix the batter once wet and dry ingredients come together.

🔄 Substitutions and Additions

• Toppings: Top each cupcake with a sugar free Peanut Butter Cup or shaved sugar-free chocolate.  Or you can drizzle melted sugar free chocolate over the frosting before serving.

• Crunch: Stir a handful of chopped peanuts into the frosting for crunch.

• Espresso powder:  Add a pinch of instant coffee to the batter to deepen the chocolate flavor.

• Almond butter: Swap peanut butter for almond butter if you want a different nutty twist.

• Cocoa powder: Sprinkle unsweetened cocoa powder or powdered sweetener over the frosting for a finishing touch.

• Caramel: Add a swirl of this sugar free Salted Caramel to the frosting for a fun variation.

• Cupcakes: You can swap the chocolate cupcakes for these Vanilla ones if you prefer.

Is Peanut Butter Keto?

Peanuts are naturally high in fat and fiber, making them perfectly fine for Keto when eaten in moderation. But, the real question as to if peanut butter is Keto, boils down to what ingredients are used to make it.

Unfortunately, some of the brands we grew up with in our PB&J sandwiches contain a significant amount of sugar.

When you’re selecting a Keto friendly peanut butter, you want to look for one that says, ” All Natural,” and also indicates there is no sugar added.

While everyone has their favorite peanut butter brands, I was introduced to Crazy Richard’s some time back and I haven’t used another brand since. Their peanut butter is rich and creamy, has no preservatives, is non GMO and it only has one ingredient…PEANUTS. Check it out along with the other products on their website.

How Many Carbs in a Chocolate Cupcake?

Traditional cupcakes have approximately 65 grams of carbs. Needless to say they are out of the question for low carb diets.

However, these chocolate cupcakes made with almond flour takes all that worry away by reducing the carbs to 3 nets carbs per serving, including the frosting! So go ahead and indulge in these delicious guilt free treats!

What is Oat Fiber? Is Oat Fiber Keto?

Oat Fiber is made from grinding the outer husks of oats. How healthy is oat fiber? It’s pure insoluble fiber, which doesn’t dissolve in water and isn’t broken down in the digestive tract, so it has zero net carbs and is perfect for a Keto Diet. It helps give a more traditional texture and that’s why I use it so often. Check out all the Keto Oat Fiber Recipes you can make!

What is a Substitute for Oat Fiber?

To get the best results, it’s best to use oat fiber if you can. If you’re unable to find it, try a combination of psyllium husk powder and coconut flour. Since both are very absorbent, you might have to add more liquid.

🍽️ More Keto Cupcake Recipes

• Coconut Lime Cupcakes
• Strawberry Cupcakes
• Gingerbread Cupcakes
• Lemon Meringue Cupcakes
• Pumpkin Cupcakes
• Chocolate Mocha Mini Cupcakes
• Coconut Cupcakes
• Lemon Cupcakes

*Originally published on June 15, 2018, updated on October 3, 2025 with improvements to the recipe, new photos, new recipe information and helpful tips.