Preheat the oven to 350 F. Line a 12 cup muffin pan with paper liners. In a medium bowl, whisk together flour, oats, pudding mix, salt, and baking soda. In a large bowl, mix butter with peanut butter, granulated sugar and brown sugar until fluffy.
Add in the egg and vanilla extract and mix until smooth. Add in the flour mixture and mix until it is fully combined. Fold in the chocolate chips and M&Ms. Evenly divide the cookie dough into the paper liners. Bake for 12-15 minutes.