It really depends on the recipe. The most basic is just regular mac and cheese with extra cheese on top and broil to color on top. Don't want to overdo it.

Some like having extras for toppings aside from cheese such as crackers, cheez-its, bread crumbs, or even hot cheetos.

Often times the mac and cheese mixture is fortified to enhance creaminess or help prevent breaking the sauce from the heat. This can be in the form of additional cheese folded in (grated cheeses or cream cheese chunks folded in, or including some sodium citrate like american cheese, velveeta, or granules to smooth out the cheese. Some recipes even call for addition of eggs before baking. There is a risk of over baking which can lead to noodles soaking up too much sauce which can lose the saucy texture and become dry, or end up breaking the sauce and end with an oily mess.

Bake it in the oven

Edit: also use real cheese, not Velveeta or something. Use a nice cheddar.

This is a very good recipe https://www.bonappetit.com/recipe/stovetop-mac-and-cheese

After that, bake it in a casserole dish/dutch oven at like 400°F for ~20m (maybe more). Keep an eye on it, bake it until it is nice and brown on top. My spouse and I also do 8oz of each cheese instead of the asymmetric amounts. Put panko breadcrumbs and parm on top before baking it to get a nice crunch.

It starts with six pounds of pig tails and two pounds of pork belly.

Disregard healthy add a good cheddar or similar cheese grill for about 5-7 mins.

I don't know if this translates to mac n cheese but if you put things like frozen pizza in a convection oven/air fryer it comes out as if it was from a pizzeria.