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.
When chicken is cooked, immediately add ½ cup/110g of water to the sheet pan and let sit. Once it has cooled slightly, scrape up any pan drippings, then shred chicken, mixing with drippings. Divide the chicken up between 6 meal prep containers.
For veggies, preheat wok over high with oil then sauté onion and peppers with salt until charred and tender, 6-8 minutes. Add corn and for cook 5 more minutes. Add sour cream and a splash of water. Stir and cook another 2 minutes. Divide the veggies up between 6 meal prep containers.
For the beans, add ⅔ of the drained beans, to a food processor. Process the beans until smooth, adding in a little bit of the reserved 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 in the remaining drained beans that were not processed. Cook for 3 minutes until thickened.
Divide the beans up between 6 meal prep containers.