01 -
Set your oven to 350°F (175°C) and grease a 9×9-inch pan or line it with some parchment paper.
02 -
Take a medium-sized bowl and combine the graham cracker crumbs with the sugar. Pour in the melted butter and mix everything until it’s crumbly and blended.
03 -
Use the mixture to form a base layer at the bottom of your baking pan. Place the pan in the oven for about 8-10 minutes, just until it turns a light golden color. Let it cool after baking.
04 -
While the crust is cooling, stir the semi-sweet chocolate chips and milk (or cream) together in a bowl that’s safe for the microwave. Heat in 30-second bursts, stirring each time, until completely melted and smooth.
05 -
Pour the melted chocolate over the cooled crust. Use a spatula to even out the layer.
06 -
Scatter the mini marshmallows all over the chocolate. Pop the pan back into the oven for another 5-7 minutes, letting the marshmallows puff up and turn golden.
07 -
If you like, sprinkle some milk chocolate chips over the hot marshmallows so they melt slightly.
08 -
Leave the pan at room temperature for 20-30 minutes to cool, then transfer to the fridge for about an hour to fully set.
09 -
Cut the chilled bars into squares and dig in!