I don’t know who decided brownie batter and cookie dough needed to be put together, but whoever did is a genius…especially when using premade cookie dough and box brownie batter. Sometimes though, even a genius idea can be spruced up a tad. Marshmallows, caramel, and peanut butter are all additional flavors that can add to the brookie. When I decided I wanted to make a quick and tasty holiday baked good, I knew I wanted to add in some of these flavors. That’s when the s’more brookie idea came to me. I also decided I needed to go big with this treat. I used my large muffin pan, but this…