Can You Add Celery And Onions To Stove Top Stuffing?

Can You Add Celery And Onions To Stove Top Stuffing? Flavors. There are a variety of flavours, including Chicken, Lower Sodium Chicken, Cornbread, Pork, Beef, Savory Herbs, Traditional Sage, Tomato & Onion, San Francisco Sourdough, Mushroom & Onion, Long Grain & Wild Rice and Roasted Garlic, Turkey, Apple and Cranberry. What are the cooking instructions