01 -
Preheat oven to 350°F (175°C). Lightly grease a 9 x 13-inch baking pan with non-stick butter spray.
02 -
Combine graham cracker crumbs, powdered sugar, and melted butter in a medium bowl. Mix with a spoon until evenly moistened.
03 -
Transfer graham cracker mixture to the prepared pan. Distribute evenly and press firmly with fingers to compact along the bottom and slightly up the sides.
04 -
Bake for 5 to 8 minutes, or until edges start to turn golden brown. Remove pan from the oven and let cool slightly.
05 -
Arrange Hershey's chocolate bars on top of the crust, covering as much surface as possible.
06 -
Return pan to oven and bake for about 3 minutes, until chocolate just begins to melt and develops a shiny appearance.
07 -
Remove pan from oven and let cool for 1 to 2 minutes. Evenly distribute mini marshmallows over the chocolate layer, packing them closely.
08 -
Set oven to broil. Place pan on the upper rack and broil for about 2 minutes, watching closely, until marshmallows are lightly browned. Do not overbroil.
09 -
Remove pan from oven and allow to cool completely. Slice into bars and serve.