Preheat your oven to 350°F.
Mix butter and sugars together. Beat well until nice and creamy.
1 c. softened butter, 1 1/4 c. powdered sugar (confectioners), 3/4 c. white sugar
Add oil, eggs, and vanilla. Mix well.
1 c. canola or vegetable oil, 2 eggs, 2 tsp. vanilla
Mix the dry ingredients in a separate bowl, then gradually add them to the wet mixture, mixing only to combine.
4 1/2 c. all-purpose flour, 1 tsp. baking soda, 1 tsp. cream of tartar, 1/2 tsp. salt
Using a cookie scoop, drop the dough onto greased cookie sheets.
Unless you prefer fat and puffy cookies, dip a cup into a bowl of sugar and lightly press the tops of the cookies with the bottom of the sugared cup.
If desired, sprinkle the tops of the cookies with Christmas sugar sprinkles or cinnamon.
Bake at 350° for about 10 minutes. You want only the bottom edges lightly browned.
Let the cookies rest on the tray for a minute before removing to a wire rack to cool.
Store in an airtight container and freeze whatever you won't eat within a few days.