Place chicken breasts, chicken stock, green enchilada sauce, diced green chiles, white beans, corn, ground cumin, chili powder, and garlic powder into the basin of a slow cooker.
Cover and cook on high for 3 to 4 hours, or until the chicken becomes tender and easy to shred. Remove the chicken from the pot, transfer to a cutting board, and shred thoroughly, discarding any unwanted fat.
Return the shredded chicken to the cooker. Add the cream cheese, ensuring it is at room temperature to prevent curdling, and stir until combined. Continue cooking for an additional 15 minutes, or until the cream cheese is fully melted and incorporated. Season to taste with salt and pepper.
Ladle the soup into serving bowls and garnish with any desired toppings.