01 -
Heat your oven to 350°F (175°C). Grease a 9×9-inch pan or use parchment paper to line it.
02 -
Stir together the graham cracker crumbs and sugar in a mid-size bowl. Pour in the melted butter and mix until it's crumbly but combined.
03 -
Push the crust mixture firmly into the lined or greased pan. Pop it in the oven for about 8-10 minutes, just until you see a little golden color. Take it out to cool.
04 -
While your crust is cooling, add the semi-sweet chocolate chips and milk (or cream) to a microwave-safe bowl. Heat it in bursts of 30 seconds, stirring between until you’ve got silky smooth chocolate.
05 -
Spread the melted chocolate evenly across your cooled crust using a spatula.
06 -
Scatter the mini marshmallows across the chocolate layer. Slide it back into your oven for 5-7 minutes, just enough for the marshmallows to puff up and toast a golden brown.
07 -
As soon as you’ve taken the pan out of the oven, sprinkle on the milk chocolate chips if using. Let them soften and melt slightly.
08 -
Set the pan on the counter to cool down for 20-30 minutes. Then, move it to the fridge and chill for at least an hour to firm up.
09 -
Once cooled, slice into squares and dig in!