Preheat oven to 350° and line a baking sheet with parchment paper.
Divide cookie dough into 2 balls and place on separate sides of
prepared baking sheet. Flatten into big disks.
When bread crumbs are toasted, transfer to a bowl and mix with
melted butter and granulated sugar.
Bake until golden and cooked through, 15 to 20 minutes. (Now is
not the time for an underbaked, gooey center!) Let cool on baking
sheet 10 minutes, then transfer to a wire rack and let cool
completely. Keep oven on.
Spread marshmallow creme on bottom of one cookie. Spread chocolate
fudge sauce on bottom of other cookie and place, chocolate-side
down, on top of marshmallow creme.
Return to oven and bake until warmed through, 3 to 4 minutes.
