Ingredients:

  • 1 cup (225g) unsalted butter, melted and cooled
  • 1 cup (200g) light brown sugar, firmly packed
  • 1/4 cup (50g) granulated sugar
  • 2 large eggs, room temperature
  • 1 large egg yolk, room temperature
  • 1 tablespoon pure vanilla extract
  • 2 1/4 cups (280g) all-purpose flour
  • 1 tablespoon cornstarch
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon fine sea salt
  • 1 1/4 cups M&M candies, divided
  • 1/2 cup dark chocolate chips (60% cacao)

Instructions:

  1. Preheat oven to 350°F (180°C) and line your 9x9 inch pan with parchment paper.
  2. Melt the butter. Let it cool for 5 minutes until it is warm but not hot.
  3. Combine melted butter with brown and granulated sugars until smooth and glossy.
  4. Add eggs, the extra yolk, and vanilla, whisking vigorously until the mixture looks velvety.
  5. Fold in flour, cornstarch, baking soda, and salt until just a few streaks of flour remain.
  6. Fold in 1 cup of M&Ms and the chocolate chips gently.
  7. Press the dough into the pan until even and flat.
  8. Press the remaining 1/4 cup of candies into the top for a professional look.
  9. Cook for 25 minutes until the edges are golden and the center is set.
  10. Let them rest in the pan for at least 1 hour until firm enough to slice.