Introduction
Brown sugar and cream are cooked to the soft-ball stage, then cooled to 125 F before you beat in vanilla and butter. You get a cooked icing with a caramel-forward flavor and a spreadable texture that works well on snack cakes, sheet cakes, and bars.
Recipe Details
- Prep Time: 5 minutes
- Cook Time: 25 minutes
- Total Time: 30 minutes
- Servings: 12
Ingredients
- 2 cups (320 g / 11 oz) brown sugar
- 1 teaspoon vanilla
- ⅔ cup (165 ml / 5.6 oz) cream
- 1 tablespoon butter
Instructions
- Boil sugar and cream together until a soft ball forms in cold water.
- Cool to 125 F.
- Add vanilla and butter; beat until thick enough to spread.
Variations
- Use dark brown sugar instead of standard brown sugar for a stronger molasses flavor and a darker icing.
- Replace the vanilla with maple extract for a more pronounced cooked-sugar flavor that leans toward maple fudge.
- Brown the butter before adding it in the final step to give the icing a nuttier finish.
- Add a small pinch of salt with the vanilla and butter to cut the sweetness and sharpen the caramel notes.
Tips for Success
- Use a heavy saucepan for the brown sugar and cream so the mixture heats evenly and is less likely to scorch.
- Check the soft-ball stage carefully; the syrup should form a soft, flexible ball in cold water, not dissolve or turn brittle.
- Cool the mixture all the way to 125 F before beating, or it can stay too loose and take longer to set.
- Stop beating as soon as the icing thickens enough to spread; if you overbeat it, it can turn dull and stiff quickly.
- Have the cake or bars ready before the final beating step, because this icing firms up fast once it reaches spreading consistency.
Storage and Reheating
Store leftover icing in an airtight container in the fridge for up to 4 days. You can freeze it in a freezer-safe airtight container for up to 1 month.
To use again, warm it gently in the microwave in 10-second bursts or on the stovetop over very low heat until it loosens, then stir or beat just enough to make it spreadable. If the icing is already on a cake, it is best served at room temperature rather than reheated.
FAQ
Do you need a candy thermometer for this recipe?
You can use the cold-water soft-ball test, but a candy thermometer makes both the cooking stage and the 125 F cooling point much more reliable.
Why did the icing turn grainy?
That usually happens if the sugar mixture cooks too far or if you beat it too long after it starts to thicken. Stop beating as soon as it loses some gloss and spreads without running.
Can you use dark brown sugar instead of brown sugar?
Yes. Dark brown sugar gives you a deeper molasses flavor and a darker finished icing.
How fast do you need to spread it?
Spread it as soon as it reaches the right thickness. Once beaten, it starts setting quickly and can become too firm to smooth neatly.
Attribution: Recipe text from “Cookbook:Brown Sugar Icing” on Wikibooks (© Wikibooks contributors).
Source: https://en.wikibooks.org/wiki/Cookbook:Brown_Sugar_Icing
License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/
Additions: intro, recipe image, recipe details (prep/cook/total time and servings), variations, tips for success, storage & reheating, and FAQ (ingredients & instructions unchanged).

