Pan Dessert: An Adventure to Come

So I was asked to make a 9x13 pan dessert for a church dinner. Pan dessert you may ask yourself.. what is that exactly? I wondered too.
"Can I make brownies?" I asked.
"It's not squares, it's pan dessert." was the answer.
Well, that was no help. So today at church, I timidly asked what was expected of me for this pan dessert thing.
"You've never made pan dessert?" she said.
"No."  
She lowers her voice... "Well, some people call it sex in a pan."
Well, I could have burst out laughing. At that moment I thought that must be the most hilarious thing I had ever heard, and I was totally not expecting that answer.
Now I have never made sex in a pan, but last week Jeff was telling me I should make it one of my challenges for this year. I guess he is going to be one lucky husband because I will have to make a practice dish before the one for the church dinner.
In conclusion:
SEX IN A PAN = PAN DESSERT @ Church