Below, you'll see any text that was highlighted with comments from the reviewer.
I like the professional tone that's been taken throughout the piece. It explores both the history of mac'n'cheese and your own personal experience behind it excellently, without seeming overly emotional or extremely distant. It's a good middle ground.
There's certainly a historical element towards it, exploring different stages of the dish - although it's done in a way that still constantly relates back to the subject matter. There's also an element of family to the piece, which makes your personal experiences more relatable and believable.
Definitely their takes on the different types of mac'n'cheese. Does one type remind you of certain experiences in your life? Do you have any preferences at all? What's your favourite version? Do you think you'll make it when you're older for your family?
The beginning is definitely what convinced me to read this piece. It subverts expectations, and is comical in an unexpected way.
Maybe add the citations as a note at the end instead? The last paragraph is extremely effective, and it's slightly lost when followed with a long string of links. But overall - a fantastic piece, and I wish you the best of luck in both the competition and your hopefully mac'n'cheese filled future!