Do you know why your mother's tuna casserole was so much better than yours will ever be?
Because she used that crappy tuna in OIL, y'all. And she used full-fat Cambell's cream-of-something soup and full fat cheese (or even better- VELVEETA!) and she did not use nor even consider using whole-grain pasta. No! She used white noodles. Or macaroni. Yes she did. You know she did.
And then she topped that puppy with MORE cheese and crushed up potato chips. Greasy, yummy, salty potato chips.
Fat carries flavor.
And that's why your mama's tuna casserole was so damn good.