Turn Instant pot to saute, or if using your slow cooker heat a pan on the stove and heat on medium heat. Once hot, add the onion, jalapeno and bell pepper. Cook until the vegetables are softened, about 6 minutes or so. Stir in the garlic, cumin and chili powder and cook until fragrant, about 30 seconds.
Transfer mixture from the skillet to the bottom of a 6-quart or larger slow cooker or if using Instant pot, turn off saute function.
Arrange the chicken breasts on top of the mixture. Add the tomatoes, chicken stock, chilies in adobo and salt. Stir gently.
Turn Instant Pot to slow cooking function. Cook on LOW for 5 to 6 hours, until the chicken is falling apart tender. Dice or shred the chicken, then return it to the slow cooker. Add the canned pinto beans and Mexican corn. Let cook on low for 20 more minutes to allow the flavors to combine and everything to heat.
Taste and add salt or seasonings as needed. If the soup is thicker than you would like, add in the remaining 1 cup chicken broth until it reaches your desired consistency. Enjoy!