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1
Adjust oven rack to middle position and preheat oven to 350u00b0F. Butter and flour muffin tin (see note).
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2
: In a small bowl, whisk together flour, baking soda, and salt. Set aside.
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3
In the bowl of a stand mixer fitted with a paddle attachment, cream together butter, sugar, and brown sugar until fluffy, about 4 minutes. Beat in vanilla and egg. Beat in dry ingredients until just combined. Stir in chocolate chips. Cover bowl with plastic wrap and place in the fridge while you make the brownie batter.
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4
: Combine butter and chocolate in a small, microwave safe bowl. Heat just until melted (about 2 20-second intervals, stirring in between). Let cool slightly.
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5
In a medium bowl, combine melted butter mixture and sugar and whisk to combine. Whisk in egg, followed by flour and salt.
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6
Drop brownie batter by the rounded teaspoon if using a standard muffin tin, or divide equally between cups (about 1/2 teaspoon each) if using mini muffin tins.
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7
Top each with a teaspoon of chocolate chip dough (you might have some left over.)
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8
Place tin in oven and bake at 350u00b0F until cookies are golden, about 20 minutes (check at 15 for mini muffin size). Let cool.
