My students love these! I bring in basic ingredients and they bring in a coffee mug. I hide the quantities of the ingredients in basic integral problems. When they solve the problems they can then mix the ingredients and microwave their cookies!
This is my student's favorite lesson! I bring in basic cake ingredients and they each bring in a coffee mug. They have to figure out the quantities of their ingredients by solving a limit problem. They then mix ingredients and microwave their cake and enjoy!