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1
Position the oven rack in the lower third of the oven.
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2
Heat to 325.
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3
Line an 8x8 baking dish with foil so it hangs over the edges about 1 inch.
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4
For the crust: Lightly butter the foil with some of the melted butter.
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5
Stir in the rest of the butter together with the crumbs, sugar, and salt.
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6
Press the crumb mixture evenly over the bottom of the pan.
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7
Bake until golden brown, about 20 minutes.
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8
Meanwhile, make the brownie.
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9
Put the butter and chocolate in pan and melt over low heat.
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10
Stir the light brown and white sugars, vanilla, and salt into melted chocolate.
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11
Add the eggs and beat vigorously to make a thick, glossy batter.
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12
Add the flour and stir just until incorporated (do not overmix).
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13
Pour the batter into the prepared pan.
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14
Bake until the top is crispy and toothpick inserted in middle comes out mostly clean, with a few crumps, about 35-40 minutes.
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15
Remove from the oven and carefully position rack about 8 inches from broiler and preheat on low.
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16
Layer marshmallows across the top and toast until broiler until golden, or about 2 minutes.
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17
Keep an eye on this so they do not burn!
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18
Cool on rack, gently removing brownies from the pan using the aluminum flaps.
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19
**These brownies are a little hard to cut because the marshmallows get sticky.
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20
Spray a sharp knife with cooking spray to cut these after they have cooled**.
