- 3 (4.8 ounce) packages graham crackers, crushed
- 6 tablespoons butter, melted
- 1/4 cup white sugar
- 1/4 (10 ounce) package marshmallows, or more to taste
- 6 cups milk
- 2 (3.5 ounce) packages instant vanilla pudding mix
- 1 banana, sliced
- 1/4 (12 ounce) package vanilla wafer cookies (such as Nilla®)
- 1 tablespoon chocolate syrup, or to taste
- Preheat oven to 350 degrees F (175 degrees C).
- Pour crushed graham crackers into a 9×13-inch baking dish. Mix butter and sugar into the graham crackers using your hands until crumbs are moist; press into the dish forming a crust.
- Arrange marshmallows in the crust, leaving space between each marshmallow.
- Whisk milk and pudding mix together in a bowl until pudding thickens, 1 to 2 minutes. Pour pudding over marshmallows. Arrange banana slices and vanilla wafer cookies atop the pudding.
- Bake in the preheated oven until marshmallows melt, 20 to 30 minutes. Drizzle with chocolate syrup.