One of these giant boxes has enough brownie mix to make 3 - 9x13 pans. Because I had 18 teachers (plus a few staff members) that I wanted to thank, I made all three pans.
I baked the brownies according to the directions and poured the batter into a parchment-lined 9x13 pan. Once they cooled, the entire pan flipped easily onto the lid.
Originally I thought I would cut each pan into 12 brownies, but later decided that the pieces just wouldn't be big enough! In the end, I decided that 8 giant brownies per pan would be perfect.
Using a spatula, I placed each individual brownie in a crisp, cellophane bag, found some leftover red ribbon from Christmas and attached a tag printed on red cardstock.
Voila! Problem solved!