Combine the dry ingredients (flour, salt, baking soda, cream of tartar) in a medium bowl and whisk together.
Combine the sugars, the butter, and the oil. Beat until this mixture is light and fluffy.
Add the egg and the vanilla. Beat them into the sugar and butter mixture.
Add the dry ingredients to the butter and sugar and mix until the flour is just incorperated. Don't overmix.
Optional: Add Sprinkles and mix in.
Add a half cup to a cup of sugar to a bowl.
Use a cookie scoop to form cookie dough balls. Roll each ball of dough in the granulared sugar before placing them on a lined cookie sheet.
Gently press the cookies flat. You can use your fingers or a cookie stamp.
Bake for 10 to 12 minutes.
How to Make Cream Cheese Frosting (Optional)
Combine the cream cheese and powdered sugar in a medium bowl.
Using a hand mixer, on low at first, blend together until the cream cheese and sugar are relateively smooth.
Add the milk and the vanilla. Mix until they are incorporated.
Add a few drops of food coloring if desired, mix the food coloring in.
Video
RECIPE TIPS
VariationsTo make snickerdoodles, add a tablespoon of cinnamon to the sugar before rolling the sugar cookie dough in it. Sprinkles or no sprinklesI usually leave the sprinkles out. For birthdays or times when I just need all the rainbow sprinkles, I like to add them. You can find nonpareils in a billion different color combos. Spinklepop has adorable sprinkles for every occasion. Wilton Cake Rainbow Sprinkles (affiliate link)are what I used in this recipe. Nordic Ware Cookie Stamps (affiliate link)are what I used to make the mermaid scale texture.