This romanian walnut buttercream cake bakes a tender, nutty crumb loaded with chopped walnuts, then covers it in rich cocoa buttercream and a snowfall of ground nuts.
It is a dessert for coffee time and celebrations, simple to mix, and the whole cake takes under two hours including cooling. The nutty crumb and the smooth frosting contrast beautifully in every slice.
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Why This Romanian Walnut Buttercream Cake Recipe Works
Whisking the eggs and sugar first traps air in the batter, so the cake rises evenly despite the heavy load of walnuts. Softened butter blends in smoothly and creates a moist, fine crumb.
Walnuts carry their own fat and flavor, which is why the cake tastes rich without any flavorings beyond vanilla. Chopping them finely lets every slice hold nuts instead of a few large chunks.
The cocoa buttercream is thick and glossy, and the ground walnuts on top echo the cake inside. Cooling the cake fully before frosting keeps the buttercream from melting.
Ingredients for Romanian Walnut Buttercream Cake
- 3 1/2 cups walnut halves, about 12 ounces, finely chopped
- 1 cup granulated sugar
- 4 large eggs
- 7/8 cup unsalted butter, softened (14 tablespoons)
- 1 teaspoon vanilla extract
- 1 2/3 cups all purpose flour
- 1 teaspoon baking powder
- 1 pinch salt
- 1 cup unsalted butter, softened, for the buttercream
- 2 1/2 cups powdered sugar, for the buttercream
- 2 tablespoons cocoa powder, for the buttercream
- 1 cup finely ground walnuts, for topping
Walnuts. Fresh walnuts taste sweeter than stale ones. Toast them for 8 minutes at 350 degrees F if you want deeper flavor, then cool before chopping.
Eggs and sugar. Beating them until pale builds structure and lifts the dense batter.
Butter. Softened butter should dent easily without being greasy, so it blends smoothly into the eggs.
Flour and baking powder. A modest amount of flour and leavening binds the nuts into a tender cake.
Cocoa buttercream. Cocoa powder gives a bittersweet balance to the sugar, and the butter keeps it creamy.
How to Make Romanian Walnut Buttercream Cake
1. Heat the oven and prep the pan Heat the oven to 350 degrees F and grease and flour a 9 inch round cake pan that is at least 2 inches deep.
2. Beat the eggs and sugar In a large bowl, beat the eggs and sugar for 2 to 3 minutes until well combined and slightly pale.
3. Add the butter Gradually beat in the softened butter and vanilla until the batter looks smooth.
4. Add the dry ingredients Whisk the flour, baking powder, and salt together, then mix them into the batter gradually until just combined.
5. Fold in the walnuts Fold the chopped walnuts into the batter with a spatula and spread it evenly in the pan.
6. Bake the cake Bake for 30 to 35 minutes, until a toothpick inserted in the center comes out clean. Cool in the pan for 15 minutes, then turn out and cool completely, about 1 hour.
7. Make the buttercream Beat the softened butter until creamy, then gradually add the powdered sugar and cocoa and beat until fluffy.
8. Frost and finish Spread the buttercream over the cooled cake and sprinkle with the ground walnuts.
How to Serve Romanian Walnut Buttercream Cake
Serve slices at room temperature with coffee or tea. A spoonful of dark chocolate mousse makes a rich pairing, while baked cinnamon rice pudding adds a warm contrast. For a dessert table, set it beside moist vanilla cake and a dish of creamy chocolate frosting for guests who want extra.
How to Store and Reheat Romanian Walnut Buttercream Cake
Store the cake in an airtight container at room temperature for up to 3 days, or refrigerate it for about a week. Bring refrigerated slices to room temperature for 30 minutes before serving so the buttercream softens.
Tips and Variations for Romanian Walnut Buttercream Cake
Chop the nuts finely. A food processor works in short pulses. Stop before the nuts turn into paste.
Toast for flavor. Toasted walnuts taste deeper and less bitter. Cool them before folding in.
Soften the butter. Leave the butter out for about 30 minutes, until it dents easily without melting.
Check with a toothpick. Dense nut cakes bake unevenly, so test the center before removing.
Cool completely. Frosting a warm cake melts the buttercream. Wait the full hour.
Sift the powdered sugar. Sifting removes lumps for a smooth buttercream.
Flag the allergens. This cake contains tree nuts, eggs, dairy, and wheat. Label it for guests with allergies.
Skip the raw batter. Do not taste the batter, because it contains raw egg and flour. For general egg safety, see the Montana State University Extension egg fact sheet.
Frequently Asked Questions About Romanian Walnut Buttercream Cake
What makes romanian walnut buttercream cake so moist?
Softened butter, eggs beaten with sugar, and the natural oils in the walnuts all keep the crumb tender. Avoid overbaking, and pull it as soon as a toothpick comes out clean.
Can I make romanian walnut buttercream cake ahead of time?
Bake the cake a day ahead, wrap it tightly, and frost it the day you serve it.
How do I serve romanian walnut buttercream cake?
Cut it into 12 slices and serve at room temperature with coffee or tea for the right balance of flavor and softness.
Can I use another nut?
Pecans or hazelnuts work in the same amounts. Toast them first for deeper flavor.
What pan should I use?
A 9 inch round pan at least 2 inches deep. A springform pan also works and makes removal easier.
Romanian Walnut Buttercream Cake
Equipment
- 9-inch round cake pan
- Electric mixer
- Mixing bowls
- Rubber spatula
- Offset spatula
Ingredients
Main Ingredients
- 3 ½ cup walnut halves about 12 ounces, finely chopped
- 1 cup granulated sugar
- 4 large eggs
- ⅞ cup unsalted butter softened
- 1 tsp vanilla extract
- 1 ⅔ cup all purpose flour
- 1 tsp baking powder
- 1 pinch salt
- 1 cup unsalted butter softened, for the buttercream
- 2 ½ cup powdered sugar for the buttercream
- 2 tbsp cocoa powder for the buttercream
- 1 cup ground walnuts for topping
Instructions
Cooking
- Prep the pan. Heat the oven to 350 degrees F and grease and flour a 9 inch round pan.
- Make the batter. Beat the eggs and sugar until combined, then beat in the butter and vanilla until smooth.
- Add dry and nuts. Mix in the flour, baking powder, and salt gradually, then fold in the chopped walnuts.
- Bake. Spread in the pan and bake 30 to 35 minutes until a toothpick comes out clean.
- Cool. Cool in the pan for 15 minutes, turn out, and cool completely, about 1 hour.
- Frost. Beat the butter, powdered sugar, and cocoa until fluffy, spread over the cake, and top with ground walnuts.
