Pre-heat oven to 350°.
Combine softened butter, white granulated sugar, brown sugar, peanut butter, eggs, corn syrup and vanilla to make a cream base for your dough.
Slowly add in your rolled oat and baking powder to complete dough.
Then combine dough with plain M&Ms and semi sweet chocolate chips.
Use a cookie dough scoop or spoon to make dough balls, place balls on a cookie sheet approx 2" apart.
Use the palm of your hand or a floured bottom of a cup to flatten dough balls to be approx 1/2" thick.
Bake cookies at 350° for 12-15 minutes or until golden brown.
Let cookies set on the pan for 3-5 minutes prior to transferring cookies to a cooling rack.
Store cookies in an air tight container!
Enjoy your Yummy Monster Cookies!