Put all ingredients into a slow cooker, stir and cover.
Heat on high for 6 hours or low for 8 hours. It is fine to leave it longer as the texture and flavor continue to improve up to 12 hours.
If you want to fry your own tortilla strips (recommended), take 5 corn tortillas and cut into long thin strips (think shoestring potato sized). Heat vegetable oil in a pot over medium high heat until 325° or until you can place a strip into the oil and it fries without smoking. Fry all strips for 30 seconds or until golden and crispy, then drain on a paper towel.