Searching for Mac n cheese recipe with penne, cubed sharp and mild cheddar, tomatoes, butter.
It was baked and the author mentioned that the bits of penne that poked out of the top of the casserole were super crunchy. I believe I came across it in early spring this year.
Recommended by Food52
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Not exactly but this has most of what you're looking for, and you can replace their 3 cheeses with 2 types of cheddar.
From the great team Johanne Killeen & the late George Germon at Al Forno.
https://food52.com/recipes...
Correction
Original had 5 cheeses (But flexibility...you can play around with the # and type).