We occasionally get gone through at that border crossing, but honestly, if you tell them what it is, COOKED whatever, they don't usually care. Call it what it is: tuna casserole, lasagna, beef bake, whatever.
Canned food is no issue.
I hate being difficult at the border, but if they want something that is technically fine under the law, I'll protest a bit.
Do remember that part of visiting a foreign country is exploring their food and ingredients and cooking with them!
Welcome to Mexico, have a great time!