Pre-heat oven to 375F. Using kitchen shears, chop chicken into bite-size chunks. Season chicken with salt, pepper, and chili seasoning.
Over medium-high heat cook chicken in olive oil until browned on all sides.
Add cream cheese, sour cream and 3/4 of the cheddar cheese to the chicken, then stir together until melted and mixed.
Add tomatoes and green chili and mix well.
In a casserole dish, add chicken mixture from the pan.
Microwave frozen cauliflower until cooked through. Use an immersion blender to blend with remaining cheese into a mashed potato-like consistency. Season with salt and pepper.
Cut a jalapeno into chunks. Spread cauliflower mixture over the top of the casserole, then sprinkle jalapeno pepper over the top. Bake for 15-20 minutes or until some colour is on the top and the jalapenos are cooked.
Slice and serve. Some fresh chopped cilantro tastes great over the top!