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Sour cream frosting is creamy, tangy, and comfortably sweet without tasting like powdered sugar. Melted white chocolate folds into whipped butter for a smooth, stable texture, and sour cream adds a gentle tang that keeps the sweetness in check.
It’s the same general lane as classic buttercream, but less gritty and less sugar-forward. You’ll get pale, glossy swirls that set up soft and taste like vanilla cream with a mellow white-chocolate finish.
Here’s Why This Sour Cream Frosting Recipe Works
White chocolate adds structure: Cocoa butter firms as it cools, so the frosting thickens without needing a mountain of powdered sugar.
Sour cream adds tang: That tang cuts the sweetness and makes the flavor read like cheesecake-adjacent, not candy.
It sets without crusting hard: As it rests, the frosting firms just enough to slice cleanly, but it stays creamy instead of forming that dry, sugary shell.
Flexible sweetness control: You can land anywhere from lightly sweet to classic frosting-sweet by adjusting the powdered sugar range.
You can see how I used this frosting on my carrot cake loaf recipe.
Ingredient Notes
White chocolate: Use real white chocolate, not white baking chips. Look for cocoa butter in the ingredient list. Chips contain stabilizers that can melt thicker and won’t give you the same smooth structure.
Butter: Use unsalted butter, softened but not greasy. If it’s too warm, the frosting can look loose before it firms up; if it’s too cold, it won’t whip smoothly.
Sour cream: Full-fat sour cream gives the best texture and tang. Low-fat sour cream will add more water and can thin the frosting too much.
Powdered sugar: Start with the lower amount and adjust. Since the white chocolate already adds sweetness and body, you may not need as much as you would in classic buttercream.
Vanilla extract: Use pure vanilla extract for a clean finish. Since this frosting is pale and simple, the vanilla flavor really comes through.
This frosting is especially good on my lemon banana cake and my coconut cake roll.
Recipe Tips
Chop the white chocolate fine: Smaller pieces melt fast and evenly, which helps prevent scorching or graininess.
Keep the heat gentle: Use barely simmering water and don’t let the bowl touch the water. White chocolate is delicate and will seize if overheated.
Watch the chocolate temp: Add it while it’s fluid and slightly warm, not hot; too hot loosens the butter, too cool makes little hard flecks.
Dial in consistency: For thicker piping, use more powdered sugar and let it sit 10–15 minutes; for a softer swoop, add sour cream 1–2 teaspoons at a time.
Re-beat after chilling: Cold frosting turns stiff. Bring it to room temperature and beat briefly to get that smooth, fluffy texture back.
White Chocolate Sour Cream Frosting
This sour cream frosting hits the sweet spot: creamy, tangy, and smooth, with white chocolate giving it a little backbone.
Spread it thick on cupcakes, swirl it on layer cakes, or smear it between cookies. Either way, you’ll get a frosting that tastes like vanilla cream and sets up into soft, clean swirls.
Try it on my carrot cake cupcakes or my vanilla cake.
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White Chocolate Sour Cream Frosting
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Ingredients
- 4 ounces white chocolate, 113 grams; or ⅔ cup chopped
- 8 tablespoons butter, softened, 113 grams
- ¼ teaspoon salt
- 1 ⅓ to 2 ⅔ cups powdered sugar, 160 to 320 grams
- 5 to 8 tablespoons sour cream, full fat, 71 to 114 grams
- 1 ½ teaspoons vanilla extract
Instructions
- Melt the white chocolate. Place the finely chopped white chocolate in a heatproof bowl set over a saucepan with about 1 inch of barely simmering water (the bowl should not touch the water). Stir gently until just melted and smooth. Remove from heat and let cool until slightly warm but no longer hot to the touch.
- Beat the butter. Use an electric mixer to beat the softened butter and salt on medium speed until smooth and creamy, about 1 minute.
- Incorporate the melted white chocolate. With the mixer on low speed, pour in the melted white chocolate and mix until fully combined and smooth, stopping to scrape the bowl as needed. If the white chocolate is still slightly warm and softens the butter more than expected, that’s fine, the frosting will firm up as it sits. It’s better to add the chocolate while it’s still fluid than to let it cool too much, which can cause it to harden into small pieces instead of blending smoothly.
- Add the powdered sugar. Add 1 ⅓ cups of the powdered sugar, mixing on low speed until incorporated.
- Mix in the sour cream. Add 5 tablespoons of sour cream and the vanilla extract and mix on low speed until combined. Increase the speed to medium and beat for 1 to 2 minutes, until smooth and creamy.
- Adjust the consistency. If the frosting seems too soft, let it sit at room temperature 10 to 15 minutes to thicken slightly or let it chill in the fridge for a few minutes. Taste, then beat in more powdered sugar a little at a time for sweetness. If it’s thicker than you want, beat in additional sour cream, 1 to 2 teaspoons at a time, until smooth and spreadable.
Notes
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
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