In an electric pressure cooker, add in the chicken breasts with ½ cup of tap water. Set to cook on high for 8 minutes (15 minutes if frozen chicken breasts).
Set the oven to 400°F. Slice the spaghetti squash in half, length-wise, scoop out the seeds and stringy middle. Lightly drizzle with olive oil, turn upside down with the inside down and place in oven to roast for 35-40 minutes.
Chop the onion, bell pepper, and jalapeno and begin sauting on the stove. Drizzle the pan with olive oil then add in the chopped vegetables. Cook on medium to medium-high stirring frequently so the peppers and onion don't burn.
After the onion begins to lightly brown, add in the frozen corn, black beans, and diced green chilis. Stir to combine and saute to warm the corn, beans, and green chilis through. Add in the cumin, smoked paprika, chili powder, and season with salt and pepper to taste.
When the chicken is finished in the pressure cooker, shred the chicken, then add into the vegetable mixture on the stove.
Once the spaghetti squash is finished roasting, take out of oven and let stand of 10 minutes. Flip over and begin using a fork to shred the meat of the squash. It should be very easy to do.
In a large baking dish, add in the spaghetti squash on the bottom, then layer with ¾ cup of the shredded cheese. Pour the chicken vegetable mixture on top. Stir to combine. Top with the rest of the cheese and if desired some tortilla chips. Place under the broiler for 5 minutes or until the cheese on top begins to bubble.
Remove and sprinkle with freshly chopped cilantro. Serve immediately with toppings such as toritlla chips, cheese, sour cream, pico de gallo, avocados.