Prepare and cook the chicken first. If you are using rotisserie chicken, shred it. If you are using canned chicken, simply drain any excess liquid. For raw chicken, cook it using your preferred method. (We normally season the chicken with salt and pepper and cook it in a cast-iron skillet.) Set the chicken aside.
The Biscuits
Now get the biscuits ready. For frozen or canned biscuits, preheat the oven and bake as directed. If you are making biscuits from scratch, gather the ingredients and make them as your recipe directs. (For a good but simple recipe, try Baking Powder Biscuits or make drop biscuits.)
The Sauce
In a large saucepan, add together the cream of chicken soups, milk, salt, pepper, and celery salt. Whisk until smooth and well combined.
If using canned vegetables, drain off any liquid. Add to the sauce mixture. Frozen vegetables can go in as is. Add the shredded or cubed chicken as well and mix well.
Allow the chicken and vegetable sauce to heat up and simmer for 10 minutes over low heat, stirring often to prevent burning.
Pour the chicken and vegetable sauce over the biscuits and enjoy!