Chop the cauliflower into small bite-sized pieces.
Place cauliflower in a saucepan with 1 cup water. Cover and cook the cauliflower on medium for about 8 minutes. You don't want to cook all the way.
Drain the cauliflower and add to a large bowl.
Preheat oven to 350 degrees F.
Mix cauliflower, sour cream, parmesan cheese, 1/2 panko bread crumbs, green pepper, salt, paprika, and Turkish Chili Pepper.
Spray the casserole dish with the olive oil spray.
Put the cauliflower in the sprayed casserole dish.
Sprinkle 1/4 cup of the panko breadcrumb on top of the cauliflower casserole.
Cook the cauliflower casserole for 30 minutes in the oven uncovered.
The casserole is ready when the cheese is bubbling and the breadcrumbs are golden.