Bring cream, garlic clove and mustard to a low boil, and simmer 5 minutes to thicken. Remove garlic clove and add in cheese; stir to melt.
Add spinach and artichokes to cheese sauce, add pasta and stir to combine. Place in a casserole dish.
Melt butter in a small pot over medium heat, swirl butter with minced garlic a minute or 2 and toss with breadcrumbs to moisten. Combine with cheese and parsley then sprinkle over casserole.
Bake mac until brown and bubbly, and serve.