Ingredients:

  • 1 cup unsalted butter, softened
  • 1 cup creamy peanut butter
  • 1 cup granulated white sugar
  • 1 cup light brown sugar, packed
  • 3 large eggs, room temperature
  • 2 teaspoons vanilla extract
  • 1 tablespoon baking soda
  • 1 teaspoon kosher salt
  • 4 cups old-fashioned rolled oats
  • 1 cup semi-sweet chocolate chips
  • 1 cup plain chocolate candies (M&Ms)

Instructions:

  1. Preheat the oven to 350°F (175°C). Line two large baking sheets with parchment paper or silicone mats.
  2. In the bowl of the stand mixer, cream together the softened butter, creamy peanut butter, granulated sugar, and brown sugar on medium speed until the mixture is light, fluffy, and noticeably paler in colour (about 3-4 minutes). Scrape down the bowl frequently.
  3. Beat in the eggs, one at a time, ensuring each is fully incorporated before adding the next. Mix in the vanilla extract.
  4. Sprinkle the baking soda and salt over the wet mixture. Beat briefly on low speed until just combined (about 15 seconds).
  5. Gradually add the rolled oats, mixing on the lowest speed possible. Mix only until the oats are barely incorporated and the dough is just holding together. Do not overmix at this stage.
  6. Remove the bowl from the mixer. Use a robust rubber spatula to gently fold in the chocolate chips and M&Ms until they are evenly distributed throughout the thick dough.
  7. Cover the mixing bowl tightly and refrigerate the dough for a minimum of 90 minutes. This chilling process prevents spreading and deepens the flavor. For the best result, chill for 2-3 hours or up to 24 hours.
  8. Using a large portion scoop, place dough balls onto the prepared baking sheets, leaving at least 2 inches (5 cm) between them. Do not flatten the dough balls.
  9. Bake for 12 to 15 minutes, rotating the tray halfway through for even colour. The edges should look set and slightly golden, but the center should still look puffy and slightly underbaked.
  10. Allow the cookies to cool on the baking sheet for 5 minutes before carefully transferring them to a wire rack to finish cooling completely.