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1
Adjust oven rack to middle position and heat oven to 350F Line an 8-inch baking dish with foil and coat foil with cooking spray.
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2
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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3
Cool mixture for several minutes.
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4
Whisk sugar, baking powder, salt, eggs, and vanilla together in medium bowl until combined, about 15 seconds.
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5
Whisk in chocolate mixture until smooth.
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6
Stir in flour until no streaks of flour remain.
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7
Scrape batter evenly into prepared pan.
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8
Bake until toothpick inserted halfway between edge and center of pan comes out clean, 22-27 minutes.
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9
Cool brownies on wir rack for 1 hour.
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10
FOR THE FROSTING:.
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11
Heat chocolate and oil in mocrowave or in bowl set over pan of simmering water, stirring occasionally until chocolate has melted and mixture is smooth.
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12
Cool until barely warm, about 5 minutes.
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13
Pour chocolate mixture over brownies and spread ovenly with spatula.
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14
Continue cooling brownies until glaze sets, 1-2 hours.
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15
Using foil, lift brownies from pan to cutting board.
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16
Slide foil out from under brownies into 2-inch squares.
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17
(Brownies can be stored in airtight container for several days).
