A classic monster cookie recipe featuring a mix of peanut butter, oats, chocolate chips, and M&M's in a soft, chewy cookie that's perfect for any occasion.
Preheat the oven to 350°F (175°C). Line baking sheets with parchment paper or silicone baking mats.
In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Beat in the eggs one at a time, then stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add this dry mixture to the wet ingredients, mixing just until combined.
Fold in the oats, chocolate chips, peanut butter chips, and M&M's until evenly distributed.
Drop rounded tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart.
Bake for 9–11 minutes, or until the edges are lightly golden but the centers still look soft. Do not overbake for a chewy texture.
Allow cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
Notes
These cookies stay soft and chewy for days when stored in an airtight container.