Soak the dates for the crust and brownie layer in hot water to soften them if needed. Drain. (Set aside 1 ½ cup dates for the brownie layer.)
Mix graham crackers for both crust and brownie layer in a food processor until ground. (Set aside 1 cup of ground graham crackers for the brownie layer.)
Mix dates with graham crackers in a food processor. It will form a ball.
Press crust mixture into a 7 ½" x 9 ½" baking dish (or similar size).
Brownie Layer
Mix ground graham crackers with cacao powder, dates, water, vanilla extract, and salt in a food processor until it comes together and forms a ball.
Spread brownie layer on top of crust, pushing down to make it even.
Sprinkle chocolate chips on top of brownie layer.
Crumble ¼ cup graham crackers on top.
Sprinkle vegan mini marshmallows on top of graham crackers.
Preheat oven broiler about 5 minutes on low.
Place brownies in broiler (to toast the marshmallows). Broil for 1 minute and check on it. Broil another 1-2 minutes if needed. Place in the fridge.
Video
Notes
These brownies will last about 1 week in an airtight container in the fridge.