Then add the ground chicken and salt and pepper to taste. Cook for about 5 minutes, breaking up the pieces as you go, or until the chicken is no longer pink. Remove from heat.
Prepare buffalo cheese: Meanwhile, bring a large skillet to medium heat and add the butter. As it starts to melt, whisk in the flour. Then whisk in the milk, chicken broth, salt and pepper.
Increase heat to medium-high and bring to a boil. Continue whisking frequently for 4-5 minutes or until mixture becomes thick. Then remove from heat and stir in the buffalo sauce and both cheeses.
Make the buffalo mac: To the skillet with the buffalo cheese, fold in the macaroni, cauliflower, chicken and onions mix until everything is well combined.