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1
Adjust oven rack to middle position and heat oven to 350F Line 8-inch baking dish with foil and coat foil with cooking spray.
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2
FOR THE CRUST:
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3
Withe fingers, combine graham cracker crumbs, sugar and melted butter in bowl, until evenly moistened.
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4
Firmly pat crumbs into prepared pan and bake until firm and lightly browned, 8-10 minutes.
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5
Remove from oven and set aside.
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6
FOR THE BROWNIES:.
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7
While crust is baking, melt chocolate and butter in small bowl in microwave or in heatproof bowl set over pan of simmering water, stirring occasionally to combine.
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8
Cool mixture for several minutes.
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9
Whisk sugar, baking powder, salt, eggs, and vanilla together in medium bowl, until combined, about 15 seconds.
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10
Whisk in chocolate mixture until smooth.
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11
Stir in flour until no streaks of flour remain.
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12
Scrape batter evenly over crust and gently push batter into corners to cover crust.
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13
Bake until toothpick inserted halfway between edge and center of pan (being careful not to insert toothick into crumb crust) comes out clean, 22-27 minutes.
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14
Remove pan from oven and turn oven to broil.
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15
FOR THE TOPPING:.
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16
Sprinkle brownies evenly with a single layer of marshmallows.
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17
Return pan with brownies to oven and broil until marshmallows are lightly browned, 1-3 minutes.
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18
(Watch over constantly, marshmallows will melt slightly but should hold their shape).
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19
Immediately remove pan from oven Cool brownies on wire rack to room tomperature, about 2 hours.
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20
Coat knife with cooking spray to prevent the marshmallows from sticking.
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21
Using foil, lift brownies from pan to cutting board.
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22
Slide foil out from under brownies and cut brownies into 2-inch squares.
