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1
Preheat the oven to 350 degrees F. Line the bottom and sides of a 9 by 13-inch baking pan with foil.
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2
You want to leave about 4 inches of overhang on the 2 opposite sides.
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3
These are going to serve as your handles to remove the bars from the pan in 1 piece, so make sure that there is enough of the overhang for you to have a solid grip.
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4
Grease the foil well with the softened butter.
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5
In your food processor, grind the graham crackers into a fine meal (you need 2 cups).
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6
In a large bowl, combine your crumbs with the sugar, sea salt and melted butter.
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7
The mixture should look and feel like wet sand.
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8
Set aside a heaping 1/2 cup of the crumb mixture for the topping.
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9
Evenly press the remaining crumb mixture into the bottom the foil-lined pan.
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10
Pop your crust into the oven and bake until it is golden brown and your kitchen smells of graham crackers, 12 to 15 minutes.
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11
Remove the crust from the oven and allow it to cool on a rack or on a dishtowel on your counter.
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12
Melt the milk chocolate in a saucepan over low heat, stirring continuously until fully melted.
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13
Do not turn up the heat to hurry this process, you must keep it on low.
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14
Alternately, you can microwave the chocolate on low power, stirring after 2 minutes.
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15
Once the chocolate is fully melted, it's time to add the chipotle pepper powder, if using, and stir it in completely.
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16
Preheat the broiler.
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17
Pour the melted chocolate over the cooled graham cracker crust.
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18
Spread the chocolate evenly over the crust with a butter knife.
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19
Sprinkle the marshmallows over the chocolate and press them lightly into the chocolate.
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20
Sprinkle the reserved crumb mixture over and in between the marshmallows so that you cannot see the chocolate peaking through the marshmallows.
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21
Broil the bars 6 inches from the flame until the marshmallows are golden brown, 1 to 2 minutes.
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22
Refrigerate the bars until the chocolate is hard, 2 hours or so.
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23
Grab the ends of the foil liner and lift the bars out of the pan in 1 piece.
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24
Move to a cutting board and cut into 24 squares.
