These soft, homemade sourdough oatmeal raisin cookies are made with tangy sourdough starter, rolled oats, brown sugar, cinnamon and raisins. The secret is to chill the dough for 1 hour (or more) for crisp on the outside, chewy on the inside, bakery-style cookies. This recipe was inspired by Love & Lemons perfect oatmeal cookie recipe, which is delightful. To their base recipe, I added sourdough starter, more cinnamon, and increased the quantities of flour and sugar to compensate for the tang…