Preheat oven to 425°F (220°C). Toss chicken thighs with olive oil, salt, chili powder, cumin, dried oregano, dried onion, & dried garlic. Roast directly on sheet pan for 25 minutes until cooked through.
For veggies, preheat wok over high with oil then sauté onion and peppers with salt until charred and tender, 6-8 min. Add corn, cook 5 more min. Add sour cream & splash of water. Stir and cook another 2 minutes.
For beans, add 2 cans, drained, to a food processor, reserving some of the bean liquid. Process until smooth, adding in a little bean liquid to loosen.
To refry beans, heat oil and minced garlic in a pan over med heat until garlic has softened. Stir in pureed beans and fry for about 3 minutes. Add 1 can whole beans, drained. Cook 3 minutes until thickened.
When chicken is cooked, immediately add 1/2c water to sheet pan and let sit. Once cooled slightly, scrape up any pan drippings, then shred chicken, mixing with drippings.