Give your next batch of brownies an instant upgrade with this easy brownie frosting! It's thick, fudgy, and rich, making it the best chocolate frosting for brownies!
Why I Love This Chocolate Frosting for Brownies
- It's easy: Yes, we are all about the easy here, and this chocolate frosting is simple as can be. If you can make a boxed brownie mix, you can make this brownie frosting recipe.
- It's delicious on boxed brownie mix or homemade: Speaking of boxed brownie mix! This frosting also gives any boxed mix an upgrade (Ghirardelli triple chocolate brownie mix is my personal fave!), but it's also perfect with your favorite homemade brownie recipe. You can even use it on my homemade cosmic brownies!
- It's rich & delicious. So. Good. This brownie frosting is way better than canned store-bought, with a supremely fudgy texture and rich chocolate flavor.
Tips & Ingredient Notes
This is just an overview, click here to jump down to the full recipe card for the recipe amounts and condensed recipe instructions.
- Unsweetened cocoa powder: I use Hershey's cocoa powder, which will give you that classic chocolate flavor. Just be sure not to use hot cocoa mix, which is something entirely different!
- Butter: I like using unsalted butter for this recipe. This helps you control the level of salt, and therefore the flavor of the brownie icing.
- Powdered sugar: no substitutions can be made here, as we need the fluffy powdered sugar to make the buttercream.
- Vanilla Extract: enriches the flavor but can be omitted in a pinch
- Salt: this enhances the chocolate flavor and helps tone down the sweetness of the powdered sugar
- Milk: we use milk in this recipe to help thin it out; you can use any type of milk or cream
Flavoring Ideas for This Brownie Icing Recipe
Want to add some flavor to your brownie topping? Try these ideas.
- Peanut butter: Add 3 tablespoons of peanut butter. You can also top this peanut butter frosting for brownies with Reese's pieces or chopped peanut butter cups!
- Mint: Add ½ teaspoon of peppermint extract. Top this mint frosting for brownies with crushed peppermint candies!
- Coffee: add 1 teaspoon of espresso powder or substitute the milk for cooled liquid espresso
- Cosmic Brownies: Use this frosting on my homemade cosmic brownies or just use it on a batch of boxes of brownies with rainbow chip sprinkles!
How to Make Chocolate Buttercream Frosting for Brownies:
- Beat ½ cup of softened unsalted butter, 2 teaspoons of vanilla extract, and ¼ teaspoon of salt in a microwave-safe mixing bowl until the mixture is smooth and creamy.
- Reduce the mixer speed to low, then slowly add ½ cup of cocoa powder and 2 cups of powdered sugar.
- Stop to scrape down the sides if needed, then add 2 tablespoons of milk and beat on high for a minute or two. At this point, you can add another tablespoon of milk to make it thinner, more powdered sugar to thicken it up, or move onto the next step.
- Heat the frosting in the microwave for 15 to 30 seconds, then stir until smooth.
- Spread it onto a 9x13 pan of brownies.
Tip: Microwaving this fudge frosting for brownies makes it glossier and easy to spread!
Storage & Freezing
Storing: You can cover the bowl (press the plastic wrap directly onto the frosting) and store this brownie frosting in the fridge for up to a week. You'll need to warm it up in the microwave again & stir it before you use it.
Freezing: Chocolate frosting for brownies can be transferred to a freezer bag or airtight storage container and frozen for up to 2 months. Let it thaw in the refrigerator, then heat it in the microwave before frosting your brownies. You may need to add a splash of milk or whip it in the mixer to help it come back together.
Frequently Asked Questions:
The high sugar ratio in buttercreams like this makes the milk & butter shelf stable for 1-2 days. If it makes you feel better, store your frosted brownies in the fridge or wait to frost until closer to serving.
You do need some kind of powdered sweetener to make chocolate icing for brownies. If you can't eat sugar, or you're avoiding it, you can try a powdered sugar substitute like Swerve instead (I haven't tested it myself).
This frosting is nice & thick and will firm up in the refrigerator. Although the sugar to milk ratio makes the frosting shelf stable for a few days, store your frosted brownies in the fridge for peace of mind.
You should let your brownies cool completely before you frost them. This keeps the frosting from getting greasy and it prevents the brownies from getting crumbs in the frosting.
The Best Chocolate Frosting for Brownies
Ingredients
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Instructions
- In a microwave-safe mixing bowl, beat the softened ½ cup unsalted butter (1 stick), 2 teaspoons vanilla extract, and ¼ teaspoon salt on medium-high speed for 1 minute until smooth. Turn the mixer to low speed then slowly add the ½ cup unsweetened cocoa powder and 2 cups powdered sugar. You may need to stop and scrape down the sides. Add 2 tablespoons milk.
- Beat on high for 1-2 minutes until creamy and the frosting is at a good consistency to pipe. If it looks too runny, add more powdered sugar. If it looks too stiff, add another 1-2 tablespoons milk until you get to the desired consistency.
- Place the mixing bowl in the microwave and heat for 15 to 30 seconds, or until glossy, easy to stir and smooth.
- Spread the frosting onto a 9x13 pan of brownies.
- Although the sugar to milk ratio makes the frosting shelf stable for 1-2 days, you may want to store your frosted brownies in the fridge for peace of mind.
Notes from Melissa
Did you make this?
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Very good, easy to make. Thank you.
Thank you so much for leaving a review!
This frosting is delicious and so easy to make. I had a little heavy cream left so I used that instead of milk. My box brownies never looked or tasted so good! I love that this recipe has just a few ingredients and tastes so much better than the store bought can. It will be my go-to chocolate frosting from now on!
I am so happy to hear you enjoyed this recipe, Paula! Thank you so much for leaving a review!
This frosting worked great, perfect for brownies, and held the m&ms I sprinkled on top perfectly! Already using the recipe for the second time. My only note is that I needed about 2 or 3 more tablespoons of milk to get it not powdery. Frosting just do be like that though. 5/5, great recipe!!
So glad to hear you enjoyed this recipe, Leyla! Thank you so much for leaving a review, I really appreciate it!
I have been trying to replicate the shiny very rich thick chocolate fudge frosting that Qwik Star/Qwik
Trip uses on their brownies. Not what they top doughnuts etc. with.
Hoping your recipe will make it happen!
Also is there any difference in using the milk or using heavy cream?
Thank you!
Hi Cass! You can use milk or heavy cream - the cream will just make a slightly thicker, more rich frosting!
It's perfect. Loved it and will definitely make again.
Thank you so much for leaving a review, Becky!
Yummy frosting and sooo easy! It really is the BEST for your brownies! LOVE this recipe!👏👏
Thank you so much for leaving a review, Cindy!
Great frosting. I've used it 3 times now and the same every time. Even good on cake!
Thank you so much for leaving a review, Peter!
Perfect frosting for brownies! Was asked to share the recipe.
Thank you so much for leaving a review!
I made this for my wife tonight and it was amazing! She absolutely raved over them and that frosting was so rich! I now have a recipe for chocolate buttercream frosting that I can use on a cake or even cupcakes. Thank you for sharing!
So glad to hear you guys enjoyed the recipe! Thank you so much for leaving a review!
It’s the best frosting I’ve ever had!!
Thank you so much for leaving a review, Kari!
Very creamy and delicious frosting. Worked great on brownies but would be good on cake or cupcakes as well.
Thank you so much for leaving a review, Rita!
It is delicious! Would have never thought of heating it!
Thank you so much for leaving a review, Charlcy!
I did the option on brownies box to make more ‘cake-like’ and they came out TOO cake-like! After using this frosting recipe though, the brownies were salvaged. Thanks!
So glad to hear you enjoyed this recipe, Jeff! Thank you so much for leaving a review!
Wow!!!! Delicious, creamy and so easy! This will be my new chocolate frosting recipe.
Thank you so much for leaving a review, Robin!
The icing is way too thick—I could hardly spread it even after adding another T of milk. It’s not creamy at all.
Did you microwave it? That is what makes it spreadable!
Sooo easy!!! kinda messy but that's because i should've used a diffrent bowl lol but wow sooo delicious!!! My go to chocolate frosting until the day I die Thank you!!!!
This is incredibly easy and so delicious. I will make this every time I need chocolate frosting even though the whole time I was making it I kept shaking my head thinking something was wrong. When you bring it out of the microwave it’s like magic. I added a total of 4 tablespoons of milk. Wonderful recipe. Yum!
So glad to hear you enjoyed the recipe, Polly! Thank you so much for leaving a review!
Best icing recipe EVER!!!!!!!!
I halved it for a smaller square pan and it was plenty. Didn’t need to use a mixer. Truly decadent!!!!!
Thank you so much for leaving a review, Linda! So happy to hear you loved this recipe!