Weigh out the ingredients
I
For the cookies, you'll need flour, sugar, butter, sour cream, eggs, vanilla extract, baking powder, baking soda, and salt.
Weigh out the ingredients
II
For the icings, you'll need powdered sugar, chocolate, heavy cream, and light corn syrup.
In a medium bowl, combine the flour, baking powder, and baking soda.
Mix dry ingredients
III
In a large separate bowl, cream together butter, sugar, and salt for 2-3 minutes until light and fluffy.
Cream butter & sugar
IV
Mix in the large egg, egg yolk, vanilla, and sour cream until fully combined. Lastly, add the flour mixture and mix until just combined.
Add wet & dry ingredients
V
Use a 3 tablespoon cookie scoop to portion the cookie dough onto the prepared baking sheets, spacing them about 2" apart. Dip a finger in water to smooth out and pat down the cookie dough balls slightly.
Portion the dough
VI
Bake the cookies for 10-12 minutes until the tops appear matte but before the edges turn golden. Allow the cookies to cool for a few minutes, then turn each of them over and set aside to cool completely.
Bake & cool
VII
Combine ingredients for both icings, heating the chocolate over the stovetop and letting the mixture cool. Spread chocolate icing over the bottom half of each cookie, then do the same with the vanilla icing. Let icing set for a few minutes, then enjoy.
Make icings & decorate
VIII