In a medium mixing bowl add the flour, baking soda, cream of tartar and salt and whisk to combine, set aside.
In the bowl of a stand mixer add butter, oil and sugars and mix to combine. Add in the eggs one at a time until fully incorporated. Add in the extracts and then slowly add the dry ingredients to the wet in 3 additions.
Bake 8-10 mins (I always under bake to 8) and remove to wire racks to cool. Frost if desired with a simple mixture of powdered sugar, milk, vanilla extract and food coloring! Decorate with sprinkles if desired and enjoy!