I would definitely incorporate safety in the kitchen with the dishes you make. You might want to start out fun and easy and make a meatless pasta dish, but eventually when you do a dish that has both meat and uncooked items, you can give a little lecture about cross contamination before the cooking begins. You can also teach about using a knife properly when the opportunity arises.
Aside from safety select to prepare foods that will teach new techniques and cooking vocabulary. Sautee, fold, mix, simmer, boil, broil, dice, slice, strain, etc. how to follow a recipe, including reading the recipe in its entirity before you even start. Also, if you can give a little background to the dish, the history of the region it’s from or how the technique developed that might be interesting. I wouldn’t spend a ton of time on it, but a quick story. Some recipes might just be from your own family and a personal story about your memories making it when you would visit your grandma, or whatever applies. Lastly, teaching where to look when measuring liquids (I can remember what that bubble looking thingy is called) using cup measure for dry ingredients, basics on converting measure like three teaspoons equals a tablespoon, etc.
Some dishes we did in my 7th grade Home Ec class are listed below:
Parker house rolls (teaches about bread and you can tell the history of the roll. You can use any bread of course, whatever you prefer).
Your favorite hot pasta dish (an opportunity to teach about al dente).
Cold pasta or potato salad.
We made butter from scratch. Also, whipped cream from scratch. Cheese from scratch. Meringue. I think children today almost never see these techniques.
Jellies and jams from scratch.
Tollhouse chocolate chip cookies (another opportunity for the history of the cookie).
A dish where you pound the chicken or meat, so they see that technique.
Julienne veggies.
Potatoes a few different ways. Au gratin, mashed, potato pancakes.
Cake and icing.
Pie crusts and pies.
For holidays you can teach some of the traditional foods for the holiday.
Maybe do an assignment where the kids bring in or teach about a dish made in their home that is a family favorite or part of their culture.