Take wood plank out of the water and let rest for a couple minutes to let the outer wood dries a bit. This ensures that the brownies to not absorb any of the water in the wood, yet still keeps the wood from catching fire on the grill.
Line the two bite brownies on the wood plank.
In a large bowl, toss the marshmallows, pecans and chocolate chips.
Even spread this mixture across the brownies.
Place the plank on the grill and close the lid.
Grill for 6-8 minutes, or until the marshmallows are toasted and lightly brown.