Add shortening and granulated sugar to an electric mixer and mix on medium until well combined.
Add eggs, vanilla, and sour cream and mix on low until there are no lumps left and everything is well mixed.
Sift together dry ingredients, add to bowl and mix on low until well combined.
Refrigerate dough for at least 30 mins to 1 hour. Cookie dough will stick to surface if not cool.
Preheat oven to 400 degrees and line a baking sheet with parchment paper or silicone baking mats.
Lightly flour a surface and grab half or so of the cookie dough. Roll to 3/4-1 inch thick (or 1/2 in for crispy cookies) using a lightly floured rolling pin. Cut using cookie cutters. Place on cookie sheets 2-3 inches apart.
Bake Cookies for 7-8 minutes or until the sides are set and the tops are starting to turn a very light brown. Let cool on cookie sheet until completely cooled before frosting.