Sour Cream Rhubarb Coffee Cake

Step 3: Mix the Cake Batter

1. 1. In a medium bowl, whisk together the flour, granulated sugar, baking powder, baking soda, salt, and cinnamon.
   2. In a separate bowl, beat the sour cream, eggs, and vanilla extract until smooth. Gradually add the wet ingredients to the dry ingredients, stirring until just combined.