BEST EVER MONSTER COOKIES - loaded with M&M candies, peanut butter and oats, these are soft, chewy and irresistible. Making them the best cookie ever.
Preheat oven to 350 degrees F (175 degrees C).
Beat butter, sugars and eggs together until light and fluffy.
Add the remaining ingredients in order, mixing well.
Use a cookie dough scooper to put on ungreased cookie sheet. Bake for 12 to 15 minutes.