Introduction
Fluffy frosting is a delightful addition to cakes and cupcakes, and it can be customized easily to suit your taste preferences. This recipe focuses on creating a light and airy texture that is perfect for any occasion, whether you are preparing a birthday cake or a simple dessert treat. The primary ingredients are common household staples, making it accessible for any home baker.
Detailed Ingredients with measures
5 tbsp flour, plain/all purpose
1 cup white sugar, regular/granulated (can reduce to 1/2 cup, Note 1)
1 cup milk, warmed using any method, full fat best (but even 0% fat works)
1 1/2 tsp vanilla extract
Pinch of salt
225g / 1 cup unsalted butter, softened but not too soft! (Note 3)
1/4 cup cocoa powder, unsweetened (Dutch processed best, if you can) – for chocolate frosting option
Prep Time
20 minutes
Cook Time, Total Time, Yield
Cook Time: 10 minutes
Total Time: 30 minutes
Yield: Approximately 12 servings
To prepare your fluffy frosting, start with the thickening roux. Place flour and sugar in a large saucepan over medium heat, and cook while stirring constantly for about 30 seconds. Gradually pour in the warmed milk, ensuring to whisk constantly to avoid lumps. As the mixture heats, it will thicken to a custard-like consistency. Once thickened, remove from heat, transfer to a bowl, and cover to avoid a skin forming. Cool completely, ideally at room temperature, before combining with the butter.
For the fluffy frosting, use a handheld beater or stand mixer to beat the softened butter until pale and smooth. Gradually add the thick roux by the tablespoon, maintaining medium speed. After all the roux is incorporated, add vanilla and a pinch of salt, beating for an additional 2-3 minutes until peaks form. For a chocolate flavor, add cocoa powder at the end and mix until combined.
This frosting can be spread or piped onto cakes or cupcakes with ease, maintaining its shape for beautiful designs. Store leftover frosting in the refrigerator and remember to take it out ahead of serving time to allow it to soften for best results.
Detailed Directions and Instructions
THICKENING ROUX
Place the flour and sugar in a large saucepan over medium heat. Cook, stirring constantly, for 30 seconds. While whisking constantly, slowly pour in the warmed milk. This ensures a lump-free mixture. As the milk heats up, it will begin to thicken; continue stirring to prevent the base from catching at the bottom. Cook until the mixture reaches the consistency of a thick, dolloping custard.
Remove from heat and transfer the mixture into a bowl. Cover with cling wrap, pressing it down onto the surface to prevent a skin from forming. Allow the mixture to cool completely. For faster cooling, leave it on the counter for about 20 minutes, then refrigerate for an additional 30 minutes. However, do not allow it to chill completely; it should be at room temperature for mixing with the butter. If prepared in advance, you may refrigerate it overnight but remember to take it out one hour before using to let it return to room temperature.
MAKING THE FLUFFY FROSTING
Place the softened butter in a mixing bowl. Using a handheld beater or a stand mixer with the whisk attachment, beat the butter for 3 minutes until it becomes smooth and lightens in color to a very pale yellow, almost white. Gradually add the cooled thickening roux, starting with one heaped tablespoon at a time. Incorporate all of it over about one minute on medium speed (speed 5).
Once all the roux has been added, mix in the vanilla extract and salt, then whip for an additional 2 to 3 minutes until the frosting holds soft peaks. It is now ready to use!
CHOCOLATE FLAVORED OPTION
To make a chocolate version of the frosting, beat in the unsweetened cocoa powder at the end of the mixing process, just until fully blended.
FROSTING CAKES AND CUPCAKES
Use the frosting on cakes and cupcakes as you would with any other frosting. Spread it on with a knife or pipe it using a piping bag. The frosting will hold its shape, allowing for sky-high mounds, as demonstrated in this recipe with vanilla cupcakes.
Notes
Sugar
Granulated sugar or caster/superfine sugar can be used. A full cup of sugar yields a sweet frosting, but it will not be as overly sweet as traditional buttercream, which typically requires 2.5 to 3 cups of sugar. You can reduce the amount to as little as 1/2 cup for a lightly sweetened whipped cream-like flavor.
Whiteness
The final color of the frosting may vary depending on the butter used. Economical butters tend to be more yellow, resulting in an off-white frosting, whereas European butters, which are paler, yield a whiter frosting. To achieve a more pure white appearance, consider using a frosting whitener or clear imitation vanilla essence, although the flavor will not be as good as pure vanilla extract. Alternatively, adding tiny drops of blue or purple food coloring can offset the yellow tint of the frosting.
Softened Butter
Ensure the butter is softened to a temperature of about 17°C/63°F. It should be pliable enough to leave an indent when pressed but cool enough that it does not feel greasy. If the butter becomes too soft, the frosting may turn out too runny.
Storage & Make Ahead
This frosting is best when used immediately after preparation. On cooler days (around 22°C/71°F), frosted cakes and cupcakes can remain at room temperature; on warmer days, refrigerate them to prevent drooping due to the butter content. Allow the frosted items to sit at room temperature for 1 to 1.5 hours before serving for best texture.
You can prepare the flour and milk roux the day before and refrigerate it overnight, but remember to bring it back to room temperature before using. The frosting can also be frozen for up to 3 months; thaw it overnight in the fridge before use.
Recipe Source
This recipe is adapted from the New York Times Ermine Frosting, utilizing similar ingredient quantities but with a slightly different technique.

Cook techniques
Thickening Roux
Place flour and sugar in a large saucepan over medium heat. Cook, stirring constantly, for 30 seconds. While whisking continuously, slowly pour in warmed milk to ensure a lump-free mixture. As the milk heats, it will begin to thicken. Continue stirring to prevent the base from catching. Cook until you achieve a thick, dolloping custard texture, then remove from heat. Transfer to a bowl, cover with cling wrap against the surface to prevent a skin, and allow to cool completely before refrigerating.
Making the Fluffy Frosting
In a bowl, place softened butter and beat using a handheld mixer or stand mixer with a whisk attachment for about 3 minutes until smooth and pale. Gradually introduce the thickened roux one tablespoon at a time while mixing on medium speed, taking approximately one minute to incorporate it all. After adding the roux, mix in vanilla extract and a pinch of salt, then whip for an additional 2 to 3 minutes until it holds peaks.
Chocolate Flavored Option
To create a chocolate variation of the frosting, incorporate unsweetened cocoa powder at the end of the mixing process until evenly combined.
Frosting Cakes and Cupcakes
Use the finished frosting to coat cakes and cupcakes. Apply it with a knife or use a piping bag for decorative designs. This frosting can support tall, piped shapes without losing form.
FAQ
Can I reduce the amount of sugar in the frosting?
Yes, you can reduce the sugar to as little as 1/2 cup for a lightly sweetened frosting.
How can I achieve a whiter frosting?
The color of your butter affects the frosting’s whiteness. For a more pure white color, consider using paler European butters or adding a small amount of blue or purple food coloring to offset the yellow tint.
What is the ideal temperature for softened butter?
Softened butter should be around 17°C (63°F), pliable enough to leave an indent but not overly greasy or melted.
How should I store leftover frosting?
The frosting is best used immediately, but if needed, it can be refrigerated and should be brought to room temperature before serving. It can also be frozen for up to three months.
How do I know if the roux is properly thickened?
The roux should reach a thick, custard-like consistency that you can dollop. It should be thick enough to hold its shape yet remain fluffy and spreadable.
Conclusion
This fluffy frosting is a versatile and delightful addition to any baked treat. Its unique thickening roux method creates a light yet sturdy texture ideal for cakes and cupcakes. By adjusting the sweetness to your taste and incorporating flavors like chocolate, you can tailor it to suit any occasion.
Chocolate Frosting Variation
For a rich chocolate experience, simply add cocoa powder to the frosting mixture after incorporating the roux.
Citrus Zest Addition
Incorporate lemon or orange zest for a refreshing citrus flavor that pairs beautifully with vanilla cake.
Nutty Flavor Twist
Experiment by adding a spoonful of almond or hazelnut extract to give your frosting an enriched nutty flavor.
Spiced Version
Add a pinch of cinnamon or nutmeg for a warm spiced frosting perfect for fall-themed desserts.
Fruit Puree Infusion
Use fruit purees like raspberry or strawberry to impart natural sweetness and a fruity flair to your frosting.
Colorful Sprinkles
Enhance the visual appeal by mixing in colorful sprinkles or edible glitter, making your baked goods festive for celebrations.
Caramel Swirl Option
For a decadent twist, swirl in homemade or store-bought caramel sauce for a delightful caramel frosting.

