Melt butter over medium heat and add garlic in a large saucepan or Dutch oven
Sauté for 30-60 seconds,
Add onion powder, black pepper, pasta, milk, chicken broth,
Cover, and bring to a simmer over medium heat
Simmer about 12 minutes until most of the liquid is absorbs. The pasta should be just shy of tender
Uncover and stir in cheese
If there seems to be too much liquid, keep simmering, stirring with the pot uncovered to allow steam to escape, until mac ’n cheese is saucy, but not soupy. Keep in mind that liquid will continue to be absorbed as pasta sits, so it’s best to err on the side of sloppy