Add 2 cups milk and continue to whisk as sauce simmers.
Add shredded cheddar and 2 ounces cream cheese. Whisk until smooth and blended. Remove from heat.
Add fresh cauliflower to sauce. Put into greased casserole dish and add Ritz butter cracker crumbs to top of casserole. Bake in a 350 degree Fahrenheit oven for 45 minutes or until cauliflower is soft and tender.