In a large bowl, whisk together the dry ingredients until combined.
Add the sour cream, milk, eggs, and vanilla. Whisk together until combined. Do not overmix.
Heat a large skillet over medium-low.
Add butter, and melt.
Spoon the pancake batter into the pan to make 3 or 4 pancakes.
Cook for 2-3 minutes, until bubbles rise and pop. The edges should look drier and set.
Flip the pancakes, and then cook for another minute or until lightly browned.
Repeat with additional butter and batter.
Video
Notes
Flour: Be sure to properly measure the flour for light and fluffy pancakes. Either weigh the flour, or stir or sift, lightly spoon into the measuring cup, and then level.
Sour cream: I've used plain, nonfat Greek yogurt to make the pancakes, and it worked out well. I recommend stirring the yogurt well before using. The pancakes will be slightly less soft and fluffy with the nonfat Greek yogurt. However, using 2% or whole milk yogurt helps with that.
Milk: Anything from skim to whole milk will work, but I recommend either 2% or whole milk for this recipe for softer, fluffier pancakes.