Preheat oven to 375 °F degrees.
Measure out all of the ingredients into bowls so everything is ready when you need it. For best results don't crack the eggs directly into the dough as you don't want to ruin your cookie dough if you get a bad egg. An advantage is this recipe doesn't require room temperature ingredients so you can make them anytime you have a craving for this yummy recipe.
In a large bowl beat the shortening and sugar thoroughly, then add the eggs, and beat until fully mixed. You can use a stand mixer or a handheld mixer - both will work fine.
Stir in vanilla and then add the flour a little at a time until well blended. (If the dough is too runny add the additional 4 tbsp flour.)
Stir in the cinnamon.
Pour the colored sugars into separate bowls.
Shape the dough into teaspoon-sized balls and roll in the colored sugar. I like to have a plate next to the bowl with the sugar in it to set the rolled dough on. FYI: when you roll the dough in the sugar it tends to lose its ball shape but that is nothing to worry about.
Put the dough onto the ungreased cookie sheet about 1.5" apart. Normally I can get 8 on a cookie sheet. They will spread as they are cooking so don't place them too close to each other.
Bake at 375 °F degrees for 8-10 minutes.
Let the snickerdoodles cool for 2 minutes on the cookie sheet. Then move the snickerdoodles to a wire rack to cool completely.
Enjoy the delicious Christmas Snickerdoodle cookies. They will keep for 4 to 5 days in an airtight container on the counter - no need to use parchment paper to separate the cookies.