Butter a 9x12" dish and set aside. Add the 2 Tbsp. butter to a large saute pan and saute the onion and red peppers over medium heat until just tender and onions are transparent.
Preheat oven to 350F.
Stir in flour, thyme, oregano, cook for 1 min. Slowly add in the chicken broth and then milk, stirring constantly. Adjust seasoning with salt and pepper. Bring up to a simmer and cook for 2 min. or until thickened.
Remove from the heat and add the cream cheese and cheddar cheese and stir until melted. Stir in the cayenne and hot sauce. Again adjust seasoning with salt and pepper as needed. Add the cooked noodles, diced chicken, onions, red pepper and cooked broccoli. Pour into the prepared pan. Combine the topping ingredients and sprinkle over the casserole.
Bake for 30 min. or until top is golden brown and casserole is bubbling.