Pat chicken pieces dry and season with chili powder, cumin and garlic powder.
Heat a large skillet over medium-high heat and add the olive oil.
Add the seasoned chicken and diced onion to the hot skillet and cook, stirring occasionally, until the chicken is cooked through and the onion is tender, about 6 minutes.
Reduce heat to medium and stir in the green enchilada sauce, cream of chicken soup and the rinsed cannellini beans; simmer gently until heated through and combined.
Stir in the tortilla strips, mixing until they are coated and begin to soften from the sauce.
Sprinkle the shredded Mexican cheese blend over the top, reduce heat to medium-low, cover the skillet and cook until the cheese is melted, about 2–4 minutes.
Uncover and serve hot with desired toppings.