The rich flavor of this lightly creamy chowder comes from slow-simmered corn cobs. After the kernels are removed, the cobs go into the slow cooker along with the potatoes and aromatics, where they infuse the broth as it slow-cooks. The corn kernels are added at the very end, so that they retain their fresh, poppy sweetness. Canned green chiles lend mild heat and tons of mellow, peppery flavor to go along with the sharper jalapeño. (If you come across fire-roasted canned green chiles, snap those up.) The miso adds a sweet-savory note that reinforces the corn flavor; but if you don’t have it on hand, add about two additional teaspoons of salt.