Preheat the oven to 350 degrees F and line several baking sheets with parchment paper.
In a mixing bowl, stir together the brownie mix, eggs, oil, and salt until well combined. The mixture will be quite thick.
Fold in the graham cracker pieces and mini Hershey kisses. Scoop about 1-2 tablespoons of dough onto the prepared cookie sheets, about 2 inches apart.
Place the cookies, one tray at a time, in the oven to bake. Bake for 6-8 minutes or until the edges are set, but the middle is a bit underdone (it will finish cooking under the broiler).
Turn the oven to broil and place 1 marshmallow into the center of each cookie. Broil on a lower rack for 1-2 minutes (watching carefully) until the marshmallows are lightly browned.
**Warning: Parchment paper is not meant to go under the broiler. Either move the cookies onto an unlined baking sheet or use extreme caution while broiling.
Once the marshmallows are lightly browned, press one Hershey Kiss into each marshmallow and move to wire racks to cool.
Continue baking the remaining cookies.