To make Green Chile Stew in the Instant Pot, follow all of the recipe instructions through step 5, using your Instant Pot's sauté function. Add the rest of the ingredients and cook over manual high pressure for 20 minutes and perform a quick release. To make Green Chile Stew in the slow cooker, follow all of the instructions through step 5, then transfer all of the ingredients to your slow cooker. Cook on low heat for 3-4 hours or high heat for 2-3 hours.