Green Chile Chicken Casserole

boneless chicken breasts, cut in half lengthwise

garlic powder (or garlic salt),

onion powder,

black pepper,

small container (8 ounces) sour cream (either dairy or dairy free will work; Daisy brand is a good choice for a dairy sour cream as it is only cultured cream)

shredded cheddar cheese or shredded cheese blend of choice (or dairy-free cheese)

– 2 cans green chiles (4 to 4.5 ounces) , drained (or 1 – 2 packages fresh green chiles, chopped; see notes)