Preheat oven to 425 degrees F. and line a pizza pan with parchment paper
Combine 1 cup flour, undissolved yeast, sugar and salt in a large bowl. Add very warm water and oil; mix until well blended, about 1 minute. Gradually add enough remaining flour to make a soft dough. Dough should form a ball and will be slightly sticky. Knead on a floured surface, adding additional flour if necessary, until smooth and elastic, about 4 minutes. Pat dough with floured hands to fill greased pizza pan or baking sheet. OR roll dough on a floured counter to 12-inch circle; place in greased pizza pan or baking sheet. Form a rim by pinching the edge of the dough.
Spread peanut butter over crust then top evenly with chocolate. Bake for 8 minutes then top with marshmallows. Bake for another 4-5 minutes until marshmallows are puffed and golden. Remove and let cool. Top with broken pieces of graham cracker and drizzle with melted chocolate. Cut into wedges and serve warm.