Season chicken with salt, pepper, and Italian seasonings. Fry in olive oil until cooked throughout. When cool to touch, dice into bite size pieces.
Sauce
In medium saucepan, melt butter and olive oil over medium low heat.
Add the garlic cream, and pepper then bring mixture to a simmer, stirring often.
Add the mozzarella and Parmesan cheese. Stir frequently. Remove from heat when sauce is thickened and smooth. (you may want to use a stick blender to break up the mozzarella cheese if needed)
Assembly
In 11x15 inch casserole pan, combine broccoli, cauliflower, and diced chicken.
Pour sauce over chicken vegetable mixture and mix in.
Top casserole with sliced mozzarella.
Bake at 350°F until cheese has browned, about 45-55 minutes.