Ingredients

• 2 1/2 cups all purpose flour
• 1 teaspoon baking soda
• 2 teaspoons cream of tartar
• 1/2 teaspoon cinnamon
• 1/4 teaspoon salt
• 1 cup/2 sticks unsalted butter
• 1 1/4 cup dark brown sugar, packed
• 1/2 cup granulated sugar
• 1 large egg
• 1 large egg yolk
• 1 tablespoon vanilla extract
• 1 tablespoon plain greek yogurt/sour cream
• 1/4 cup granulated sugar
• 2 teaspoons cinnamon

Instructions

1. In a medium bowl mix together the flour, baking soda, cream of tartar, 1/2 tsp cinnamon and salt. Set aside.
2. In a medium saucepan over low-medium heat cook the butter. Cook until it reaches a brown/caramely color. The butter will begin to have a nutty aroma. Take off and pour into another bowl to cool.
3. Im bowl of an electric mixer combine butter, brown sugar and 1/2 granulated sugar until mixed together. Add in egg and egg yolk. Add in vanilla and greek yogurt.
4. Slowly mix dry ingredients into wet ingredients. Wrap in plastic wrap and chill for at least 3 hours.
5. After chilling preheat oven to 350F and line a baking sheet with a silpat liner.
6. in a small bowl combine 1/4 granulated sugar and 2 teaspoons of cinnamon.
7. Scoop dough to 2 tablespoons size and roll in cinnamon sugar.
8. Place on baking sheet and bake for 9-11 minutes. Take them out when they look almost done. Let cool on pan for 5 minutes then transfer to a wire rack.