Bring a pot of salted water to a boil. Cook the macaroni pasta al dente according to package instructions, drain and set aside.
While your pasta is cooking, preheat your oven to 350 degrees.
In a large saucepan, melt butter until bubbly. Stir in flour until combined and cook for 1-2 minutes. It should smell nutty at the end of the 2 minutes.
On medium heat, add cream and chicken broth to the roux (butter & flour mixture) and whisk until smooth. Cook, stirring frequently, until thickened and bubbly.
Once thickened, cook for 2 more minutes and reduce the heat to low/simmer. Add the Velveeta cheese first. Once it's fully melted and combined, add in the monterey jack cheese and stir until melted.
Fold in your chicken and add salt and pepper to taste. You can also add some garlic powder if you'd like! If the sauce is too thick for your preference, add 1/8 cup of chicken broth to thin it out.
Once you've seasoned your sauce, add your macaroni pasta and stir to combine. Pour the entire mixture into a greased casserole dish.
Bake for 30 minutes and enjoy!