To prepare a pistachio cake with white chocolate buttercream baked goods recipe, first you need to prepare the cake batter. Preheat the oven to 350?F (180?C) and grease and flour two 8-inch round cake pans. In the bowl of an electric mixer, cream the butter and sugar until light and fluffy. Add the eggs and vanilla and beat until combined. Gradually beat in the flour mixture, scraping down the sides of the mixing bowl as needed. Pour the batter into the greased pan and bake for 35 to 40 minutes, or until toothpick inserted in center comes out clean. Let cake cool in pan for 10 minutes before removing to wire rack to cool completely.