Sprinkle flour on a work surface and roll out each piece of dough into a 12 to 14-inch round, 1/4-inch thick. Dust a pizza peel with cornmeal and slide onto the pizza stone. Bake for 6 to 8 minutes or until just beginning to brown.
While pizza crust is baking, toast almonds in a saute pan over medium-high heat. Remove almonds to a plate, and in the same pan, melt the butter. When butter is melted, add the graham cracker crumbs, chili powder, cayenne and salt. Cook for 2 to 3 minutes. Remove from heat and set aside.
Remove pizza from oven and top with half of the marshmallows, randomly place 1 bar of chocolate over marshmallows and return to the oven, 3 to 5 minutes or until marshmallows are puffed and lightly browned. Remove pizza from oven, sprinkle with half of the graham cracker mixture and top with half of the toasted slivered almonds. Repeat for the second pizza. Let the pizzas rest for 3 to 4 minutes, then slice and serve.