Remove the lid and add the garbanzo beans, kidney beans, and edamame. Let simmer, uncovered, until the chili has thickened, about 30 minutes. If, at the end of the 30 minutes, you would like your chili thickened more, you can continue cooking or add 1 tbsp of cornstarch (mixed with 1 tbsp water) and let it cook a few minutes until thickened.