This brownie frosting recipe delivers five rich, creamy toppings that turn a simple pan of brownies into a standout dessert. From a classic fudge frosting to a light whipped vanilla option, each version is made with everyday ingredients and comes together in minutes. The key is matching the frosting to the brownie type—dense and fudgy frostings pair best with cakey brownies, while lighter options work well with dense, fudgy bases.
Ingredients
Classic Fudge Frosting
- 1/2 cup (115 g) unsalted butter
- 1/4 cup (60 ml) whole milk
- 1/3 cup (40 g) unsweetened cocoa powder
- 3 cups (360 g) powdered sugar, sifted
- 1 teaspoon vanilla extract
- Pinch of salt
Chocolate Buttercream
- 1/2 cup (115 g) unsalted butter, softened
- 2 cups (240 g) powdered sugar, sifted
- 1/2 cup (50 g) unsweetened cocoa powder
- 3–4 tablespoons (45–60 ml) heavy cream or milk
- 1 teaspoon vanilla extract
- Pinch of salt
Cream Cheese Frosting
- 8 oz (225 g) cream cheese, softened
- 1/4 cup (55 g) unsalted butter, softened
- 2 cups (240 g) powdered sugar, sifted
- 1 teaspoon vanilla extract
- Pinch of salt
Peanut Butter Frosting
- 1/2 cup (130 g) creamy peanut butter
- 1/4 cup (55 g) unsalted butter, softened
- 1 1/2 cups (180 g) powdered sugar, sifted
- 2–3 tablespoons (30–45 ml) milk
- 1/2 teaspoon vanilla extract
Vanilla Whipped Cream Frosting
- 1 cup (240 ml) heavy whipping cream, cold
- 2 tablespoons (15 g) powdered sugar
- 1 teaspoon vanilla extract
Instructions
Classic Fudge Frosting
- In a medium saucepan over medium heat, melt the butter. Add the milk and cocoa powder, whisking until smooth and heated through (about 2 minutes). Do not boil.
- Remove from heat and gradually whisk in the powdered sugar, a cup at a time, until fully combined. Stir in vanilla and salt.
- Let cool for 5–10 minutes until it thickens slightly, then spread over cooled brownies. It will firm up as it cools.
Chocolate Buttercream
- In a large bowl, beat the softened butter with an electric mixer until creamy, about 1 minute.
- Add the cocoa powder and powdered sugar, beating on low until combined. Add cream (or milk) one tablespoon at a time until you reach a spreadable consistency.
- Beat in vanilla and salt, then increase speed to medium-high and whip for 1–2 minutes until light and fluffy.
Cream Cheese Frosting
- In a large bowl, beat the cream cheese and butter together until smooth and no lumps remain, about 2 minutes.
- Gradually add the powdered sugar, beating on low until incorporated. Add vanilla and salt, then beat on medium speed for 1 minute until fluffy.
- Use immediately or chill briefly if too soft.
Peanut Butter Frosting
- In a medium bowl, beat the peanut butter and butter together until smooth.
- Gradually add the powdered sugar, alternating with milk, until the frosting is spreadable. Stir in vanilla.
- Spread over brownies; this frosting sets nicely at room temperature.
Vanilla Whipped Cream Frosting
- Chill a large bowl and beaters in the freezer for 10 minutes.
- Pour the cold cream into the chilled bowl and beat on medium-high until soft peaks form.
- Add powdered sugar and vanilla, then continue beating until stiff peaks form. Do not overbeat, or it will turn to butter.
- Spread over brownies just before serving; this frosting does not hold up at room temperature for long.
Tips
- Cool brownies completely before frosting. Warm brownies will melt butter-based frostings and cause them to slide off.
- Sift powdered sugar to avoid lumps that make frosting grainy.
- Adjust consistency: If frosting is too thick, add milk or cream one teaspoon at a time. If too thin, add more powdered sugar.
- Storage: Frosted brownies keep in an airtight container at room temperature for up to 2 days (except cream cheese and whipped cream versions, which must be refrigerated).
Serving Suggestions
Spread frosting generously over a 9×13-inch pan of brownies for a classic treat. For a neater presentation, chill the frosted brownies for 30 minutes before slicing. Top with sprinkles, chopped nuts, or a drizzle of caramel for extra flair. Serve with a glass of cold milk or a scoop of vanilla ice cream.
Variations
- Mint Chocolate: Add 1/2 teaspoon peppermint extract to the classic fudge frosting and a drop of green food coloring if desired.
- Mocha: Dissolve 1 tablespoon instant espresso powder in the milk before adding to the fudge frosting.
- Orange Cream Cheese: Add 1 tablespoon orange zest and 1 tablespoon orange juice to the cream cheese frosting.
- Nutella Frosting: Replace the peanut butter in the peanut butter frosting with an equal amount of Nutella; reduce powdered sugar to 1 cup (120 g).
Storage and Reheating
Store frosted brownies in an airtight container at room temperature for up to 2 days for buttercream, fudge, or peanut butter frostings. Cream cheese and whipped cream frostings must be refrigerated within 2 hours and will keep for up to 3 days. To freeze, place unfrosted brownies in a freezer-safe container for up to 3 months; thaw overnight in the refrigerator, then frost. Do not microwave frosted brownies, as the frosting will melt and become runny.
Frequently Asked Questions
Can I use this frosting on other desserts? Yes, all five frostings work well on cakes, cupcakes, and cookies. The fudge frosting is also excellent as a dip for fruit or pretzels.
Why is my buttercream frosting grainy? Graininess usually comes from unsifted powdered sugar or from adding sugar too quickly. Always sift the powdered sugar and beat at low speed until incorporated, then increase speed to whip air in.
Can I make these frostings dairy-free? Yes, for the fudge and buttercream, substitute plant-based butter and milk (like almond or oat milk). Cream cheese frosting can be made with dairy-free cream cheese, but it may be softer; chill before spreading.
How do I get a shiny, smooth fudge frosting? The classic fudge frosting is poured while still warm, which gives a glossy finish. If it becomes too thick, reheat gently over low heat, adding a teaspoon of milk to restore pourability.
Can I use this frosting on warm brownies? No, always cool brownies completely. Warm brownies will cause the frosting to melt and slide, and the texture will be compromised.
How far ahead can I frost brownies? Buttercream and fudge frostings can be applied up to 24 hours ahead and stored at room temperature. Cream cheese and whipped cream frostings should be applied no more than a few hours before serving, and must be refrigerated.
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