Brown sugar cake is a tender, buttery layer cake sweetened with brown sugar, which gives it a mellow molasses flavor and a moist crumb. This straightforward version pairs two 8-inch cake layers with a brown sugar frosting; serve it at room temperature so the cake and frosting stay soft.
Ingredients
- 2 1/2 cups (300 g) all-purpose flour, spooned into the measuring cup and leveled
- 1 1/2 teaspoons baking powder (6 g)
- 1/2 teaspoon baking soda (2.5 g)
- 1/2 teaspoon fine salt (3 g)
- 3/4 cup (170 g) unsalted butter, softened
- 1 1/2 cups packed (300 g) light brown sugar
- 3 large eggs (about 150 g without shells), at room temperature
- 2 teaspoons vanilla extract (10 ml)
- 1 cup (240 ml) buttermilk, at room temperature
For the frosting
- 1/2 cup (113 g) unsalted butter
- 1 cup packed (200 g) light brown sugar
- 1/4 cup (60 ml) whole milk
- 1/4 teaspoon fine salt (1.5 g)
- 3 cups (360 g) powdered sugar, sifted if lumpy
- 1 teaspoon vanilla extract (5 ml)
Instructions
- Prepare the pans and oven. Set a rack in the center of the oven and preheat to 350°F (175°C). Grease two 8-inch (20 cm) round cake pans, line the bottoms with parchment, then grease the parchment. Dust the sides lightly with flour.
- Combine the dry ingredients. Whisk the flour, baking powder, baking soda, and salt together in a medium bowl. Set aside.
- Cream butter and sugar. Using a stand mixer with the paddle attachment or a hand mixer, beat the softened 3/4 cup butter and brown sugar on medium speed for about 3 minutes, until lighter in color and fluffy. Scrape the bowl and beaters once or twice so no dense butter remains at the bottom.
- Add eggs and vanilla. Beat in the eggs one at a time, mixing until each is incorporated before adding the next. Scrape the bowl, then mix in the vanilla. If the mixture looks slightly curdled, continue; it should come together when the flour and buttermilk are added.
- Finish the batter. Add about one-third of the flour mixture and mix on low just until combined. Add half the buttermilk, followed by another third of the flour, the remaining buttermilk, and the remaining flour. Mix only until no dry streaks remain; scrape the bowl and fold once or twice by hand if needed. Divide the batter evenly between the pans and smooth the tops.
- Bake. Bake for 28–32 minutes, rotating the pans front to back after about 20 minutes if your oven browns unevenly. The cakes are done when the tops spring back lightly and a toothpick inserted in the center comes out clean or with a few moist crumbs. For an extra check, USDA FSIS lists 160°F (71°C) as the safe minimum for egg dishes; a thermometer placed in the center should reach that temperature. Avoid overbaking, which can dry the layers.
- Cool the layers. Let the cakes cool in their pans for 10 minutes, then run a thin knife around the edges and turn them onto wire racks. Remove the parchment and let the layers cool completely, about 45 minutes. Do not frost warm cake, since the frosting will melt.
- Make the frosting base. While the cakes cool, melt the frosting butter in a medium saucepan over medium-low heat. Stir in the brown sugar, milk, and salt. Bring to a gentle simmer, stirring frequently, and cook for 2 minutes. Remove from the heat and cool for 15 minutes, until warm but no longer hot.
- Beat and frost. Transfer the brown sugar mixture to a mixing bowl. Beat in the powdered sugar gradually on low speed, then add the vanilla. Increase to medium and beat until smooth and spreadable. If it becomes too firm, beat in milk 1 teaspoon (5 ml) at a time; if too loose, add powdered sugar a tablespoon at a time. Place one cooled layer on a serving plate, spread with about one-third of the frosting, top with the second layer, and frost the top and sides.
Tips
- Pack brown sugar firmly into the cup before weighing or measuring. Light brown sugar gives a gentle caramel note; dark brown sugar works too, with a stronger molasses flavor and slightly deeper color.
- For a buttermilk substitute, stir 1 tablespoon (15 ml) lemon juice or white vinegar into 1 cup (240 ml) milk and let it stand for 5 minutes. It will be thinner than cultured buttermilk, but works in this batter.
- Use room-temperature eggs and buttermilk so they blend smoothly into the creamed butter. If the butter is greasy or nearly melted, chill it briefly; butter that is too warm will not trap air well.
- Measure flour by weight when possible, and stop mixing as soon as it is incorporated. Extra flour or overmixing can make the cake dense and tough.
Serving Suggestions
Let the frosted cake stand at room temperature for 20–30 minutes before slicing if it has been chilled. Cut with a long, sharp knife, wiping the blade between slices for neat layers. Serve on its own with coffee or tea, or add fresh berries and a spoonful of lightly whipped cream to balance the sweetness. A small pinch of flaky salt over each slice is also a pleasant contrast to the caramel-like frosting.
Variations
For a more pronounced molasses taste, replace the light brown sugar with dark brown sugar in both cake and frosting. Add 1 teaspoon ground cinnamon to the dry ingredients for a warm spice note, or fold 1 cup (120 g) toasted chopped pecans into the frosting before spreading. To make a 9-by-13-inch (23-by-33 cm) single-layer cake, bake the batter in a greased, parchment-lined pan; begin checking at 30 minutes and expect roughly 32–38 minutes, since pan material and oven performance vary. Frost it in the pan once completely cool.
Storage and Reheating
Because the frosting contains milk, refrigerate the cake within 2 hours of serving. Cover it in a cake carrier or place slices in an airtight container; it keeps well for 3–4 days refrigerated. Let slices sit at room temperature for 20–30 minutes before serving for a softer crumb and frosting. To freeze, wrap unfrosted layers or individual frosted slices airtight and freeze for up to 2 months; thaw overnight in the refrigerator, then bring to room temperature. Do not microwave frosted slices for long, as the frosting can melt unevenly.
Frequently Asked Questions
Can I make the cake ahead?
Yes. Bake the layers up to a day ahead, cool completely, wrap each tightly, and keep at room temperature in a cool place. Make the frosting and assemble the cake the day you plan to serve it, or refrigerate the finished cake as directed.
Can I use salted butter?
Yes. Use the same amount of salted butter and reduce the added salt in the cake and frosting by about half. Salt levels differ by brand, so taste the frosting before spreading and adjust if needed.
Why did my cake turn out dense?
Common causes are too much flour, butter that was too warm, or overmixing after adding the flour. Weigh the flour if you can, cream softened rather than melted butter, and mix the final batter only until the dry streaks disappear.
How do I know when the cake is baked?
The center should spring back when pressed lightly, and a toothpick should emerge clean or with a few moist crumbs. Check the center rather than relying on color alone, and avoid opening the oven during the first 20 minutes.
Can I make this without a mixer?
Yes, if the butter is very soft but not melted. Beat the butter and sugar vigorously with a sturdy whisk or wooden spoon until fluffy, then add the eggs one at a time. A mixer makes the creaming step easier, but careful hand mixing works.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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