Preheat the oven for 350 degree
In a large pot boil salted water and cook the pasta until al dente.
Drain and place it in the pot.
To make Sauce: In a large skillet over medium heat, melt the light butter. Add the flour and mix nicely.
Cook for a minute. Add milk and mix well so that there are no clumps remaining.
Simmer for two minutes or until thickened.
Add cream cheese and now mix with a wooden spatula until it is mixed properly.
Now add Frank’s ranch seasoning and stir until they are mixed completely. - Add chicken and the cooked ziti to the skillet and stir until the pasta is coated completely.
Top this with a layer of cheddar cheese and bake until melted and golden for 15 minutes.