Instructions

1. Preheat oven to 350°F. Grease a cookie sheet with butter and set aside.
2. In a standing mixer fitted with paddle attachment (can also use an electric mixer), mix butter and both sugars until fluffy, about 1 minute. Add in yogurt, egg, and vanilla extract and mix for an additional minute.
3. Add in flour, salt, baking soda, and cream of tartar. Mix on high for 30 seconds. Remove from mixer and fold in oats and raisins.
4. In a small bowl, toss together 1/2 cup granulated sugar and cinnamon. Scoop cookie dough into roughly 1/4 cup balls (2.5 inches in diameter), coat thoroughly in cinnamon sugar mixture, then place onto prepared cookie sheet, leaving 2 inches between each cookie. Push the balls down just slightly so they look like a hockey puck.
5. Bake cookies for 13 minutes. They will still look moist, but will continue to cook as they cook. Let cookies rest on cookie sheet for 10 minutes (this will crisp the bottoms and allows the cookies to rest!). DEVOUR.