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1
Preheat oven to 350 degrees.
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2
Spray an 8x8-inch square baking dish with non-stick baking spray, or grease and flour the pan.
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3
In a small bowl, combine the flour, baking powder, and salt; set aside.
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4
In a medium bowl, whisk the melted butter and brown sugar together.
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5
Add the egg and vanilla and mix until well combined.
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6
Fold the flour mixture into the egg mixture until just mixed (be careful not to overmix).
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7
Fold in the chocolate chips and spread the batter into the prepared pan and bake for 20 minutes.
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8
While the cookie layer bakes, prepare the brownie batter. In a medium saucepan, melt the butter.
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9
Once melted, remove from heat and whisk in the sugar until combined.
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10
Add the eggs, one at a time, mixing well after each addition.
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11
Stir in the vanilla.
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12
Whisk in the dry ingredients until combined.
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13
Once the cookie layer comes out of the oven, immediately pour the brownie batter on top and return the pan to the oven.
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14
Bake for 30 - 35 minutes, or until a toothpick inserted in the middle comes out with a few crumbs clinging to it. Allow to cool completely before frosting or serving.
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15
To make the frosting: In a medium bowl, cream the butter.
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16
Gradually beat in confectioners' sugar, cocoa and vanilla.
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17
Add the milk, 1 tablespoon at a time, as needed, until frosting reaches desired consistency.
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18
To make the glaze: Combine the sugar and the vanilla in a small bowl.
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19
Whisk in the milk, a little at a time, until the desired consistency is reached. The glaze can be piped on top of the frosting for decoration.
