
Preheat the oven to 350℉. Grease and flour 1 bundt pan or two 9" round pans.
Place melted butter in a glass bowl and whisk in the yogurt, sugar, eggs, and vanilla. Whisk in salt, baking soda, and flour and mix until just blended. Pour the batter into the bundt pan or two 9" round pans.
Bake 1 hour (bundt pan) or 25 minutes (9" pans) until a toothpick test comes out clean. When cook, sprinkle with Confectioner's sugar or frost with the buttercream frosting.
With an electric mixer, whip together the butter and shortening until light and fluffy, around 20 minutes. (this is critical to prevent the frosting from being greasy.) Gradually add milk, sugar, and vanilla. Frost the cake once it's cool. Serve with fresh berries.