Preparation Steps

• Preheat the oven to 350°F. Line baking sheets with parchment paper. Set aside.
• In the bowl of a stand mixer with a paddle attachment, beat the butter until smooth, about 1 minute.
• Add the peanut butter and beat for about 2 minutes until smooth.
• Add brown sugar and mix until smooth, about 2 minutes.
• Add eggs one at a time, mixing for 30 seconds after each addition. Scrape down the sides if necessary.
• Add flour, oats, baking soda, and salt. Mix on low until just combined.
• Add M&M candies and chocolate chips, mix until incorporated.
• Use a 2-tablespoon scoop to drop dough onto prepared baking sheets. Flatten each into a disk.
• Add about 1 tablespoon of marshmallow fluff onto each disk. Cover with a second disk and seal edges.
• Top with mini M&M candies if desired.
• Bake for 15-16 minutes, until edges are golden brown. Cool completely before serving.