Cook white rice and set aside.
Spray a 6qt crock pot lightly with non stick cooking spray. Add chicken breast and season with garlic salt, pepper, onion powder, and paprika.
Add diced onion and minced garlic on top of chicken and pour in chicken stock, cream of mushroom soup, and cream of chicken soup. Cover and cook on LOW 5-6 hours, or HIGH 3-4 hours.
30 minutes before done, add in sliced mushrooms and finish cooking. Once done add in cooked rice and cheese. Cover and let sit 5 minutes for cheese to melt, stir and garnish with parsley. Serve warm.