My husband's favorite is my Seafood Alfredo (mussels, shrimp, squid, octopus, crab in fettuccine Alfredo). I made a pesto version of it when I was down visiting his family in Mexico. It was funny watching his little brothers try octopus for the first time.
My favorites of mine are: Beef Sangria, Barbacoa, and Flounder Soup.
I'm also known for my Guacamole (Just don't tell anyone that it's mostly from the packet, except for a couple of my own touches
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Baking: Chocolate Chunk Pumpkin Muffins (or bread), Banana Oatmeal Bread, Marranitos