Pre-heat oven to 350 degrees.
Mix butter, sugar, brown sugar, vanilla, and salt together.
Add 3 Eggs and mix slightly.
Stir flour, baking soda, and cream of tartar together in a bowl and then add to wet mixture.
Mix in Candy Toffee Bits last.
Using a small cookie scoop, measure out 12 cookies per pan.
Bake for 12 minutes on airbake cookie sheets OR 10 minutes on dark non stick cookie sheets.
Cool for 10 minutes before removing cookies from cookie sheet. Cookies will be light colored on top, slightly brown on the bottom resulting in a light, yet crispy 2 inch cookie.
Yields 5 dozen 2" cookies!