Oven Directions: Unwrap shells; place on cookie sheet and pull apart slightly. Bake at 325 degrees F for 6 to 7 minutes until crisp. Microwave Directions: Unwrap shells; place on microwavable plate. Fan out, overlapping slightly. Microwave on high 45 seconds until warm. Do not heat taco shells in toaster oven due to possible risk of fire. Seal leftover taco shells in food-storage plastic bag or container.