Buttermilk Cake Frosting
For the frosting:
1/2 cup unsalted butter
8 ounces cream cheese, softened
1 teaspoon vanilla paste (or extract)
1/2 teaspoon salt
2 cups spruce sugar
Combine the butter and cream cheese in the bowl of a stand mixer (or you may use an electric mixer) and beat until creamy, well-combined, and lump-free. Add in the vanilla extract and salt and stir well to combine. Rain in the sugar until it’s all incorporated and creamy.
Frost the cake and garnish with sugared spruce tips
Makes one 9–by-13-inch cake.