Lightened-Up Creamy Green Chile Chicken Enchiladas

whole-wheat tortillas (I love the ones by One Degree Organics)

chicken breasts, cooked & shredded

extra virgin olive oil or grass-fed butter

small yellow onion, diced

large cloves garlic, minced

green chiles

organic sour cream or plain greek yogurt (full fat is preferable!)

shredded organic sharp cheddar cheese, divided

green enchilada sauce