Preheat oven to 350F (180C). Line a baking tray with baking paper.

Whisk together flour, rolled oats, baking soda and salt in a large mixing bowl. Set aside.

In a second large bowl, use a whisk or an electric mixer to whisk together the softened butter with the brown sugar and granulated sugar. Once the butter/sugar mixture is creamy add the vanilla extract and peanut butter and mix until combined.

Next, mix a little of the flour into the butter mix at a time, making sure it gets stirred together well in between adding more. When you have mixed in all the flour, add the M&M's and the chocolate chips and gently stir them into the dough until they are evenly dispersed. Use a tablespoon to scoop the cookie dough into small 1,5 inch balls and place them on the lined baking tray, making sure to leave sufficient room for the cookies to spread while baking.

Bake the cookies in the oven for 10-12 minutes or until the top of the cookies are set and they are just turning golden brown. Remove the cookies from the oven and allow them to cool on the baking tray for 10 minutes. Let the cookies cool completely before eating and enjoy.