Not for sure, but likely it was bisquick pancakes when I was 9 or 10.
Mom and pop had six kids and both worked full time to keep a roof over our heads. So, mom taught the oldest to cook starting at 11 years old. By age 12, that kid was responsible for cooking fairly simple meals (tacos, fried pork chops, spaghetti and meat sauce, hamburger's, hamburger helper, etc.) Mon-Fri. Mom would cook and teach more complex recipes on weekends to that child. Then, when the next kid hit 11 years old they'd get a few lessons from the older sibling, and mom on weekends. I was the #4 child and had an interest, so I started "helping out" a little early. Some of the kids were better cooks than others...we had some interesting "casseroles" growing up.
Truth is, I'm a pretty decent cook and still love doing it. I do most of the cooking in our house and have for years. Barb's also a very good cook (and an excellent baker). She sometimes has to kick me out of the kitchen when she wants to cook.
Tonight I'm cooking a Filet Mignon (cooked Medium for Barb), a Ribeye (Medium Rare for me) both with a peppercorn sauce, Sauteed mushrooms (for me), a baked potato (for Barb), and a garden salad for both of us. She'll be drinking a Decoy Chardonnay, and I'll have a Rodney Strong Cabernet. For dessert...the rest of the Cabernet LOL.