Preheat the oven to 350 F. Line a 12 cup muffin pan with paper liners. In a medium bowl, whisk together flour, oats, salt, and baking soda.
In a large bowl, combine butter with peanut butter, granulated sugar, and brown sugar until fluffy. Add in 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 between the prepared liners. Bake for 12-15 minutes. Remove from the oven and place chocolate kisses on each cookie cup.
