Ingredients
Equipment
Method
Step-by-Step Instructions
- Brown the butter in a medium saucepan over medium heat, stirring frequently until golden brown, about 5-7 minutes.
- In a large mixing bowl, mix the cooled brown butter with brown sugar, granulated sugar, egg, extra yolk, and vanilla extract until creamy.
- In a separate bowl, whisk together flour, baking soda, baking powder, cornstarch, and salt.
- Gently fold the dry mixture into the wet ingredients, being careful not to overmix, and then add M&Ms.
- Preheat oven to 350°F (175°C), line the sheet pan with parchment paper, and spread the dough evenly.
- Bake for 18-22 minutes until the edges are golden and the center is soft.
- Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.
Nutrition
Notes
Store in an airtight container at room temperature for up to 5 days. For a chilled option, refrigerate for up to 7 days. Freeze cookie squares for up to 3 months.
