This Overnight Coffee Cake is so perfect when you are serving guests. Prepare it the night before, let it sit in the refrigerator overnight, add the topping the next morning and bake.
Grease and flour a 9x13-inch baking pan. In a medium bowl, whisk together the dry ingredients and set aside.
In a large bowl, use an electric mixer to combine the butter and sugars. Add eggs and milk and beat until combined. Add dry ingredients alternating with buttermilk. Beat at low speed until blended well, about 4 minutes. Pour into baking pan. Refrigerate overnight.
The next morning... preheat oven to 350 degrees. Drizzle the coffee cake with 1/4 cup melted butter. Combine sugar, nuts and nutmeg, and sprinkle topping on top. Bake 30 minutes or until top is a rich, golden brown. Cool for 15 minutes and serve warm.