I can tell you that there is really no such thing as Catholic cuisine. Instead, each family's food tends to reflect its culture. My father had an Irish mom, so corned beef and cabbage was our norm on St. Patrick's day. My Polish/Russian maternal grandmother made wonderful potato pancakes and stuffed cabbage.
Years ago there was a Catholic custom of meatless Fridays (I think that still may be the case during the Lenten season.) When I was a child, meatless was normally interpreted to include fish. In my family, fish and chips were a normal Friday evening dinner. Although I am no longer a practicing Catholic, I often still enjoy fish for my Friday supper. Fish on Friday is comfort food for Catholics.
Growing up, Sunday evening was my mom's "day off" for cooking. We just had whatever was easy to prepare.
I'm not sure there is a Mormon Cuisine as much as local. Cuisine.
There is the infamous mormon funeral dinner of cheesy potatoes, ham, jello and weak punch.
In the 60s there were recipes in the relief society magazine that included non alcoholic drinks for parties and the obligatory savory jello dish. (Tuna and green jello!) But I think that was more the era than mormonism.