Steam the tempeh in a metal steamer basket over an inch (2.5cm) or so of boiling water in a covered saucepan or pot for 10 minutes. Drain, coarsely chop, and set aside.
In a large saucepan, heat a a few tablespoons of water over medium heat. Add the red onion and bell pepper, cover, and cook until softened, about 5 minutes.
Blend together the white miso paste and hot water.
Add the miso mixture and garlic, then stir in the tempeh, mushrooms, chili powder, oregano, black cumin, and pippali. Cook until fragrant, about 1 minute. Add the tomatoes, beans, and corn.
Cover and simmer over low heat, stirring occasionally, until the chili is thick and flavorful, about 30 minutes. Stir in the cilantro. If the chili is too thick, stir in a little water. Serve hot.