01 -
Preheat oven to 163°C. Grease a mini muffin tin with 24 spaces or prepare to bake in batches if you have a smaller tin.
02 -
In a medium mixing bowl, blend 85 grams melted butter with light brown sugar and granulated sugar until smooth. Add egg and vanilla extract; stir to combine. Mix in flour and kosher salt until well blended, then incorporate mini chocolate chips.
03 -
Refrigerate the cookie dough while preparing the brownie filling to facilitate easier handling.
04 -
In a small saucepan, warm 85 grams butter just until melted. Off heat, whisk in granulated sugar and cocoa powder until smooth. Whisk in egg and all-purpose flour. Allow mixture to cool until just warm, about 10 minutes.
05 -
Divide chilled dough evenly among muffin tin spaces. Roll each portion into a ball, then press with fingers to form an even, thin shell up the sides of each cup. If the dough sticks, moisten fingertips with water.
06 -
Spoon brownie batter evenly into prepared tart shells. Bake 9–11 minutes, or until brownie centers are just set.
07 -
Immediately after baking, sprinkle each tart with a small pinch of flaked sea salt if desired. Let cool completely in pan before removing.
08 -
Store cooled brownie bites in an airtight container at room temperature for up to 3 days.