Preheat the oven to 350 F. In a medium bowl, whisk flour with salt, and baking soda. In a large bowl, mix together butter and sugar until fluffy. Add in the egg and vanilla extract until smooth.
Add in the flour mixture, mix until it is fully combined. Fold in the crushed graham crackers and chocolate chips. Press the cookie dough into a greased round 9-inch pie plate.
Bake for 20-25 minutes. Remove from the oven and top with marshmallows and chocolate bars. Bake for another 5-10 minutes.