Preheat oven to 350F. Spray a 13” pizza pie pan with nonstick spray.
In a medium bowl whisk together ¾ cup graham cracker crumbs, flour, and baking soda.
In a medium bowl with a stand mixer, cream together the butter, sugars, and salt.
Slowly add in the egg and vanilla and mix until creamy. Add in the dry ingredients and slowly mix until fully combined.
Using your hands, press the dough firmly into the bottom of the pizza pie pan.
Use a fork to pierce the dough all over, about 20-25 times.
Bake for 8-10 minutes or until the crust begins to brown and is baked through.
Remove from the oven and immediately sprinkle with 1 cup chocolate chips, leaving a rim around the outside untouched (for the “pizza crust”).
After about 3-4 minutes, the chocolate chips will have melted enough for you to be able to use a spoon to spread it out, like “pizza sauce”. Spread out until smooth.
Sprinkle with the remaining ¼ cup graham cracker crumbs, then the mini marshmallows and remaining ¼ cup chocolate chips.
Place under a broiler set to high for 1-3 minutes or until the marshmallows are just browned. Watch closely so the marshmallows don’t burn.
Remove from the oven and drizzle with chocolate sauce.