For my last activity I had laid out all the ingredients for cookies in my kitchen. I told the girls we were going to make cookies. They were so excited. They said "how much should we put in" and I would just say "What do you think?" So they finally got their cookies mixed (with things like 4 tsp salt, 1/2 C milk, and 3 eggs because there were 3 girls :) ). They decided to bake them on 400 for 20 minutes. As you can imagine they were nasty tasting.
I then said "Oh, I have a recipe". So we pulled out the recipe and made another batch. While they were cooking we worked on our A of F. When they came out we talked about the difference of having a plan vs. just doing what seems good at the time.