Preheat oven to 350° F.
In a large mixing bowl, beat eggs briefly. Then add brown sugar and granulated sugar, and beat on medium speed to just incorporate. Then add butter, and beat on medium speed until incorporated.
Add vanilla, corn syrup, baking soda, peanut butter, and oats, and mix on medium-low speed until oats are very evenly incorporated. Then fold in chocolate chips, M&M candies, and raisins with a sturdy spatula or wooden spoon. (You can vary the mix-ins however you like, just aim for 1 cup total.)
Scoop dough tightly with a 2-tablespoon scoop and place dough on a sturdy, non-coated baking sheet. Press in additional mix-ins if desired.
Bake for about 12 minutes, or until edges are lightly browned. Remove baking sheet from oven and let cookies cool on pan for 5 minutes, and then transfer cookies to a cooling rack.
