Pre-heat the oven to 375° F.
Cream, or mix together, the butter and brown sugar.
Mix the peanut butter into the creamed mixture.
Add the egg and vanilla extract into the creamed mixture and mix well.
Whisk together the flour, baking soda, and salt.
Add the dry ingredients to the wet ingredients, mixing well.
Mix the oats into the cookie dough.
Add the chocolate chips, peanut butter chips, M&M'S, and SNICKERS candies into the cookie dough, mixing everything in well.
Using a cookie scoop, drop cookies onto a cookie sheet.
Bake at 375° F for 8 to 10 minutes, or until the cookies are lightly golden and done.
While the cookies are still on the cookie sheet, gently press candy eyeballs into each cookie.
Remove the cookies to a wire rack to cool.
Serve with a mug of ice cold milk!