Ingredients for the cake 12T               Unsalted butter at room temperature 1-1/2C Granulated sugar 3ea                Extra large eggs at room temperature 1-1/2t            Pure vanilla extract 1-1/2C Sour cream 2-1/4C AP flour 1/4C              Corn starch 1/4C              Baking powder 1/2t                Kosher salt Ingredients for the streusel 3/4C              Light brown sugar, packed 1/2C              AP flour 1-1/2t            Ground cinnamon 1/4t                … Continue reading Sour Cream Coffee Cake