01 -
Preheat oven to 350°F. Line three baking sheets with parchment paper.
02 -
In a large bowl, beat butter, granulated sugar, and powdered sugar with an electric mixer. Add oil and continue mixing, scraping bowl sides as needed. Incorporate egg and both extracts; mixture may curdle slightly, which is acceptable.
03 -
In a separate bowl, whisk together flour, baking soda, cream of tartar, and salt.
04 -
Add dry mixture to wet ingredients. Beat until just combined, scraping sides and bottom of bowl as necessary.
05 -
Reserve ¼ cup of granulated sugar for topping finished cookies. Pour ½ cup of sugar into a wide, shallow container for coating dough balls.
06 -
Scoop dough into approximately 2-teaspoon portions using a 1-teaspoon scoop heaping full. Place 8-10 dough balls at a time into the sugar container and gently toss or shake to coat thoroughly.
07 -
Place coated dough balls about two inches apart on prepared sheets, roughly 30 per sheet. Flatten each ball using a cookie stamp or bottom of a glass.
08 -
Bake for 9 to 12 minutes until the cookies puff and edges begin to set; they will crisp further while cooling.
09 -
Immediately after removing pans from oven, sprinkle tops with reserved sugar. Transfer sheets to wire racks and cool completely before storing.