Mrs. Sigg's Snickerdoodles

• 2 Eggs, large

• 2 3/4 cups All-purpose flour

• 1 tsp Baking soda

• 2 tsp Cinnamon, ground

• 2 tsp Cream of tartar

• 1/4 tsp Salt

• 1/2 cup Shortening

• 2 tsp Vanilla extract

• 1 5/8 cups White sugar

• 1/2 cup Butter