Set your Instant Pot® to the saute setting. Add the oil and onion and saute for about 4 minutes, until fragrant and golden.
Stir in the garlic, chili powder, cumin, oregano, and garlic powder. Saute for another minute and then add the diced tomatoes, corn, carrots, bell pepper and adobo sauce and stir.
Add the chicken, chicken stock, freshly ground pepper to taste, and 1/2 teaspoon of salt. Select the manual setting and set the time for 10 minutes. When finished cooking, do the quick-release method (refer to Instant Pot® instruction manual).
Remove the chicken and place onto a cutting board. Let cool for a couple of minutes and then shred using two forks or dice if you prefer. Transfer chicken back to the Instant Pot. Taste and adjust salt and seasoning accordingly, adding 1/4 teaspoon of salt at a time.
Serve with tortilla chips, and additional toppings as desired, such as avocado, shredded cheese, fresh cilantro, fresh lime, and hot sauce.