I know the owner of a small Mexican restaurant who allowed me to use her dining area for this class. I charged $30 for a 2 hour class which included lunch. Each student got 5 pre-baked cookies (4 sugar and 1 gingerbread), 3 disposable pastry bags, 2 couplers, tip #2 and #3, 2 tablespoons merengue powder, and a mitten cookie cutter, and a laminated practice template I downloaded from karenscookies.net.
I limited the number of participants to 15 and I had 3 on a waitlist. They learned how to pipe, flood, sugaring, and wet on wet. They most enjoyed the wet on wet technique because it was easy and quick. I was amazed at how creative many of them were too.
One other thing I realized was how much more money I can make in 2 hours teaching these classes than I do selling cookies.