Preheat oven to 350 degrees F (175 degrees C). Grease a 12 cup muffin tin with butter or cooking spray.
In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt. Set aside.
In a large bowl, mix together melted butter and sugar until well blended. Beat in eggs and vanilla. Gradually add dry ingredients to the wet mixture, stirring until just combined.
Fold in the chocolate chips. Divide the batter evenly among the 12 muffin cups. Bake for 18-20 minutes, or until a toothpick inserted into the center of a brownie cup comes out clean.
Let cool in the pan for 10 minutes, then carefully remove and place on a wire rack to cool completely.
Interesting Facts
Brownie cups are a fun twist on traditional brownies.
You can customize them with different chocolate chips and toppings such as nuts or sprinkles.
They can be stored in an airtight container in the refrigerator for up to 5 days.