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Brown sugar is the star of the show in this homemade Brown Sugar Icing with notes of caramel and molasses mingling in this pourable, dreamy frosting.

Overhead close-up shot of buttermilk icing in a glass dish with a silver whisk

Brown Sugar Icing

This brown sugar icing (a.k.a. caramel icing) was super easy to whip together, and it turned a regular sheet cake into something memorable. Don’t be intimidated by the need to boil the brown sugar; just stir constantly and everything will turn out great!

This frosting would be tasty over cupcakes, cookies, or even served warm with pancakes or waffles for a Saturday morning feast. If you love the caramelized flavors of brown sugar and butter, then you have got to give this one a try.

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Overhead vertical shot of sliced cake with buttermilk icing

This recipe makes enough caramel frosting to cover a cake in a 9×13 pan (approximately 16 servings). If you are baking a smaller cake (e.g. an 8×8 pan), you’ll only need half as much. The cake in the photos here is this Buttermilk Cake and it’s a perfect match for the caramel-inspired brown sugar icing.

You can adjust the ingredient list within the recipe card by simply adjusting the serving amounts to reflect the desired amount. For a half batch, set the servings to 8.

Overhead shot of brown sugar and butter in a saucepan

Old Fashioned Caramel Icing

It’s possible that you have fond memories of your grandmother whipping a batch of frosting quite similar to this old fashioned caramel icing. This topping for baked goods always carries a double helping of nostalgia.

I know how that magic is created now with simple ingredients, heat, and time. But, the transformation of ingredients to baked goods still reminds me of the wonder I felt, watching my grandmother produce such incredible goodies.

Overhead shot of melted butter and brown sugar in saucepan with silver whisk

Buttermilk Icing

You’ll need the following ingredients to make this recipe:

  • butter
  • light brown sugar
  • buttermilk
  • vanilla extract
  • powdered sugar
Overhead shot of buttermilk mid-pour over saucepan with melted butter and brown sugar

While your cake is baking, combine the butter and brown sugar in a saucepan over medium-high heat. Then, whisk to combine and bring to a boil.

Reduce the heat to low before adding the buttermilk. Then, whisk again until combined. Then, remove from the heat entirely. Add the vanilla and start adding the powdered sugar.

Overhead shot of butter, brown sugar, and buttermilk in saucepan being stirred by a silver whisk

Whisk again until everything is nice and smooth. Sometimes, adding in the powdered sugar a bit at a time can help keep things manageable to get the right consistency.

Pour the warm frosting over the cake while it is still warm from the oven. Spread gently with a spatula, as needed to cover the cake.

Overhead shot of melted butter, brown sugar, buttermilk, and powdered sugar in a saucepan

Homemade Frosting Recipes

Looking for more incredible homemade frosting recipes?

Incredibly moist, soft chocolate cake topped with a fluffy, melt-in-your-mouth Peanut Butter Frosting is a dessert worthy of the most special occasions.

Vertical shot of buttermilk icing dripping from a silver whisk into a liquid measuring cup; in the background, a blue and green floral print hand towel

Dulce de Leche Cupcakes are a delicious combination of soft caramel cake topped with creamy dulce de leche frosting to satisfy all your sweet caramel cravings.

Perfect for pineapple and coconut lovers alike, Pineapple Cake with Coconut Frosting is full of pineapple flavor and just a hint of coconut, layered with creamy coconut cream cheese frosting and sprinkled with toasted coconut. 

Vertical shot of buttermilk icing mid-pour over a cake in the pan

While a good fudgy brownie is hard to beat, Strawberry Frosted Brownies are a fun twist on the classic dessert. And, you’ve got to try fluffy Key Lime Cupcakes with a graham cracker crust, topped with smooth lime cream cheese frosting.

These old-fashioned Pumpkin Cookies with Cream Cheese Frosting are big and soft, just like your favorite bakery-style pumpkin cookies. This is a classic fall cookie recipe.

Vertical shot of cake with buttermilk icing mid-serve

This fantastic whipped Cocoa Buttercream Frosting recipe requires just 5 ingredients. With barely ten minutes of effort, you’ll have enough rich, fluffy chocolate frosting to top a dozen cupcakes.

Fluffy Blackberry Buttercream Frosting piped high over a soft, vanilla cupcake tastes like spring has arrived. The sweet and slightly tangy frosting perfectly complements the vanilla base, creating a light and colorful combination.

Vertical shot of a slice of cake with buttermilk icing, served on a small blue plate; in the background, the remaining cake and a blue and green floral pattern hand towel
5 from 4 votes

Brown Sugar Icing

Avatar photoMary Younkin
Brown sugar is the star of the show in this homemade icing with deep notes of caramel and molasses, mingling in this pourable, dreamy frosting.
Prep Time: 5 minutes
Cook Time: 10 minutes
Servings: 16
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Ingredients 

  • cup butter
  • 1 cup light brown sugar
  • cup buttermilk
  • 1 teaspoon vanilla extract
  • 1⅔ cups powdered sugar

Instructions 

  • While your cake is baking, combine the butter and brown sugar in a saucepan over medium-high heat. Whisk to combine and bring to a boil. Then, reduce to low heat and add the buttermilk. Whisk again until combined.
  • Remove from the heat and add the vanilla and powdered sugar. Whisk again until smooth. Pour the warm frosting over the cake while the cake is still warm from the oven. Spread gently with a spatula, as needed, to cover the cake.

Notes

This is enough frosting for a 9×13 cake, approximately 16 servings. If you are making a smaller cake (i.e. an 8×8 cake) you’ll only need half of the frosting. You can adjust the ingredient amounts by adjusting the serving amounts higher or lower in the recipe card. For a half batch, set the servings to 8.

Nutrition

Calories: 139 kcal | Carbohydrates: 26 g | Protein: 0.2 g | Fat: 4 g | Saturated Fat: 3 g | Polyunsaturated Fat: 0.2 g | Monounsaturated Fat: 1 g | Trans Fat: 0.2 g | Cholesterol: 11 mg | Sodium: 40 mg | Potassium: 27 mg | Sugar: 26 g | Vitamin A: 126 IU | Calcium: 18 mg | Iron: 0.1 mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Vertical shot of buttermilk icing mid-pour over a cake in the pan

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Recipe Rating




22 Comments

  1. C K Oxley says:

    This is exactly what I’m looking for to glaze a butter/pecan Bundt cake.
    I usually don’t buy buttermilk because I end up throwing some much away. I do have powdered buttermilk that I can reconstitute. Do you think that will work and still have the proper constituency? Could I possibly substitute sour cream for the buttermilk? Thanks for your help.

    1. Mary Younkin says:

      Yes, powdered buttermilk will work nicely here.

  2. Salvador says:

    How would this cake icing work on corn bread

    1. Mary Younkin says:

      I suppose it would work fine. I’ve never put icing or frosting on cornbread though, so I can’t speak for how it might taste.

  3. Christmas says:

    I tried this for the first time and it’s amazing. I had some left over and I wanted to know will it keep and if so how long? Thank you for sharing.

    1. Mary Younkin says:

      This should be fine in the fridge for a few days. I haven’t tried freezing it.

  4. Leila says:

    5 stars
    I put this on oatmeal bars. A fan fav. Recommend to anyone who likes sugar.

    1. Mary says:

      I’m glad it’s a hit!

    2. Christmas says:

      5 stars
      I tried this for the first time and it was amazing. My family loved it. I had some left over and I wanted to will it keep and if so how long? Thank you for sharing.

      1. Mary Younkin says:

        I’m thrilled that it was a hit!

  5. Terri says:

    5 stars
    Wow this icing is really good- Me as a beginner at baking, this impressed my family! Thanks from a 15yr old!

    1. Mary says:

      YAY! That’s the best compliment. I’m so glad you liked it!

  6. Laura Ellen Riehle says:

    2 questions: can I mix vinegar and milk to make buttermilk, and, can I put this on a cooled cake?

    1. Mary says:

      Yes to both questions, Laura. Happy baking!

  7. Sylvia says:

    Unfortunately, the recipe isn’t specific enough about how much of each ingredient should be used, either for the cake or the icing. Speaking in terms of cups, tsp, tbs.

    1. Mary says:

      Hey Sylvia, if you scroll to the bottom of the post (or click that handy Jump to Recipe button at the top of the post) you’ll see a printable recipe card with detailed instructions and all of the measurement amounts.

  8. Shayla says:

    Can you freeze this and use for later?

    1. Mary says:

      That should work fine, Shayla. You’ll want to thaw it in the fridge (vs room temp or the microwave) and then whip it to the desired consistency again.

  9. Carole says:

    Hello, thank you for such an appetizing recipe. I’m new to using cups, so I’d like some clarification, please.
    When you write 1 2/3 cup powdered sugar, does that mean 1 cup + another cup of 2/3 or does it mean a single cup of 2/3?
    Thank you in advance for your reply.

    1. Mary says:

      Hi, Carole. It’s one and two-thirds cups of powdered sugar. I hope you’ll love the icing!

  10. Jennifer Brentano says:

    5 stars
    Wholly cow, this icing is amazing!

    1. Mary says:

      I’m glad you’re loving the icing, Jennifer. Happy baking!