Girls that age are perfectly capable of using a stove with a little supervision. It's certainly no more dangerous than handing them a knife.
Why don't you have them plan menus for certain occasions using foods they enjoy? For instance: slumber party, pizza party, picnic, dinner for mom & dad, etc.
A slumber party, for instance, would call for snacks, drinks, and breakfast the next morning. They could plan the menu, establish a budget, and go shopping for the ingredients. One day would be spent doing the prep work, then they could actually have the party and enjoy the fruits of their labor.
Don't forget what it was like to be that age, and have a good time with the girls!
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