I cook it on moderate heat for 5 minutes. It smells like biscuits. I always taste a little too. I use a box grater.
I’m using cheap Aldi/LIDL cheese, but it’s still aged. I will try with mild cheddar and/or the other suggested cheeses above. I know even a pinch will work like magic, but I’m not a sodium citrate person. I don’t even use corn starch in my bechamel. I tried evaporated milk once, and it worked very well, but it bothered me. Part of the fun for me is practicing again and again, trying to figure out the puzzle.
This last time, I did exactly this. I cooked the pasta longer and used a hot convection oven. The cheddar on top did leak some oil, so I will try a harder cheese on top next time. Overall, it was a success. The little one is just okay with mac and cheese, but loved it. My other eater, well … “It’s fine but it would’ve been better if it was curdled.”