Snickerdoodle Skillet Cookie

Ingredients

• 3/4 cup butter, softened
• 1 cup sugar
• 1/2 cup brown sugar
• 1 egg, room temperature
• 1 egg yolk, room temperature
• 2 teaspoons vanilla
• 2 1/4 cup flour
• 1 teaspoon salt
• 1 1/2 teaspoons cream of tartar
• 1/2 teaspoon baking soda
• 1 1/2 teaspoon cinnamon