Beat sugar, shortening, butter, eggs and vanilla with a hand mixer.
Add sour cream and beat well.
Mix dry ingredients together and gradually add into wet ingredients until just incorporated.
Cover and refrigerate dough for at least an hour.
Preheat oven to 350 degrees.
Roll cookie dough out onto a clean, floured surface to ½" thick.
Cut dough into shapes.
Bake for 8-10 minutes until just done.
Cream Cheese Frosting
Whip sugar, butter and vanilla.
Add cream cheese and a dash of salt. Mix.
Add ½ cup milk alternating and powdered sugar, then beat. Add more milk or more sugar until you have desired consistency.
Add food coloring (optional.)
Frost cookies after they are fully cooled.
Notes
Watch your first batch of cookies closely in the oven. Once you can figure out the exact time to bake cookies in your oven you can set timers for the remaining batches.