Ingredients:

  • 115g unsalted butter, melted and cooled
  • 150g packed light brown sugar
  • 50g granulated sugar
  • 1 large egg (50g), room temperature
  • 5ml pure vanilla extract
  • 30g Dutch-process cocoa powder
  • 125g all-purpose flour
  • 3g baking soda
  • 1.5g salt
  • 130g rainbow chocolate chips (mini)
  • 946ml premium vanilla bean ice cream, slightly softened

Instructions:

  1. Whisk together the melted butter, brown sugar, and granulated sugar in a large bowl until smooth.
  2. Beat in the egg and vanilla extract on medium speed for 2 minutes until the mixture is pale and fluffy.
  3. In a separate bowl, whisk cocoa powder, flour, baking soda, and salt, then gradually fold into the wet mixture using a spatula.
  4. Gently fold in the rainbow chocolate chips until evenly distributed.
  5. Transfer the dough to a bowl, cover tightly with plastic wrap, and refrigerate for at least 12 hours.
  6. Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
  7. Scoop 2-tablespoon portions of chilled dough, roll into balls, and space them 2 inches apart on the sheet.
  8. Bake for 10–12 minutes until edges are set but centers remain soft.
  9. Cool cookies on the pan for 10 minutes before transferring to a wire rack to cool completely.
  10. Place one cooled brownie cookie flat side up on a tray.
  11. Scoop vanilla ice cream onto the center and spread evenly toward the edges using an offset spatula.
  12. Place a second cookie on top and press gently to secure the sandwich.