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1
Set oven rack in lower middle position; preheat to 325u00b0F.
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2
Spray 9 X 13-inch baking pan with nonstick spray.
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3
Press 18x12-inch sheet aluminum foil over bottom and up long sides of pan, leaving overhang on each long side. (This helps to lift the brownies out of the pan with ease).
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4
Spray foil with nonstick spray.
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5
Whisk flour, baking powder, and salt in small bowl.
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6
Stir both chocolates and 10 tablespoons butter in medium saucepan over medium-low heat until melted and smooth; remove from heat.
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7
Whisk sugar and vanilla, then eggs into chocolate mixture.
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8
Whisk until glossy and smooth, about 1 minute.
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9
Add dry ingredients and whisk just to blend.
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10
Pour batter into prepared pan.
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11
Bake until tester inserted into center comes out with some moist crumbs attached, about 22-24 minutes.
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12
Cool completely in pan on rack.
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13
Using electric mixer, beat room temperature cream cheese and next 3 ingredients in medium bowl until smooth.
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14
Spread cream cheese frosting over brownies.
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15
Sprinkle nuts or coconut over.
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16
DO AHEAD Chocolate brownies can be made 1 day ahead.
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17
Cover and chill.
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18
Using foil overhang for handles, remove brownies from pan.
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19
Cut into 18 squares; serve cold or at room temperature.
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20
**Cook time does not include cooling completely after baking or chilling in refrigerator before cutting and serving.