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1
Preheat oven to 375u00b0F. Spray a 36-count mini muffin tin with nonstick cooking spray. Set aside.
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2
In a medium bowl, whisk flour, salt, baking powder, and cocoa powder. Set aside.
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3
In another medium bowl, combine butter, semi-sweet chocolate chips and dark chocolate. Melt in the microwave over medium heat, stirring occasionally, until smooth. Set aside to cool slightly.
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4
In a large bowl, beat sugar and eggs until light and fluffy. Beat in vanilla extract. Stir in melted chocolate. Slowly stir in flour mixture until just incorporated.
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5
Spoon batter into prepared muffin tin, filling about 3/4 full. Bake for 9-11 minutes, or until brownies are set. Remove from oven and allow to cool completely in muffin tin.
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6
To make the nutella frosting, beat butter in a large bowl with an electric hand mixer or stand mixer with fitted paddle attachment until light and creamy, about 2-3 minutes. Add powdered sugar, 1 cup at a time, until incorporated. Add Nutella, heavy cream, and vanilla. Beat for about 3-4 minutes, or until light and creamy.
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7
Pipe or spoon frosting on top of cooled brownie bites. Enjoy!
