Vegetarian cauliflower mac & cheese recipe

Ingredients

• 1 pound dry elbow pasta
• 1/4 cup of unsalted butter plus more to top
• 1/4 cup of AP flour
• 2 cups of whole milk
• 1 cup of heavy cream
• 1 teaspoon. of dry mustard
• 3 cup of grated cheddar cheese
• 1 cup of parmesan cheese plus more to top
• 1 cup of breadcrumbs
• 1 cup of grated cauliflower
• 2 teaspoons . of fresh thyme