Butter an 8-inch-square baking pan. Preheat oven to 350 degrees F.
In a large bowl, stir together brown sugar, oil, and egg until smooth. Mix in nuts and vanilla. In a small bowl, mix together the ground popcorn, baking powder, and salt. Add popcorn mixture to the batter, stirring well. Spread evenly in the buttered pan. Bake for 20 minutes or until a toothpick inserted into the center comes out clean. Cut into squares while warm.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.