All slow cookers differ in temperature a little – Know thy crockpot. Cooking time may vary base on the make and model of your slow cooker. If you start with frozen peaches, expect the cobbler to take at least an hour longer. This recipe can also be made in the oven to reduce cook time. Prepare in a 5-6 quart baking dish. Bake at 350 degrees F for 30-45 minutes.