Wrap the garlic whole in foil and roast at 425F for 45 minutes until very soft. Remove from the foil to let cool while you make the sauce.

In a large pot over medium-high heat, add the butter and flour. When the butter melts, whisk the mixture together to form a paste, then pour in the half and half, whisking as you go. Add the melted cheddar and stir in to form a cheese sauce.

Cut the garlic in half crosswise and squish in the roasted cloves. Add the pasta, blue cheese, and mozzarella as well. Gently stir the mac together, and taste: add salt and pepper to your preference.

Turn the mac and cheese into a baking dish broil for 5 minutes until golden, or bake for 45 minutes until hot and bubbly if you've made the mac and cheese in advance.

Enjoy!