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+ servings
Monster cookies on a plate

Oatmeal Monster Cookies

Everything you want in Oatmeal Monster Cookies like oats, chocolate chips, peanut butter and Smarties! This large batch cookie recipe makes enough to feed a small army! Oatmeal cookies on crack!
Course Dessert
Cuisine American
Keyword monster cookies recipe, oatmeal monster cookies
Prep Time 10 minutes
Cook Time 12 minutes
Servings 75 cookies


  • KitchenAid Mixer
  • Ice Cream Scoop


  • 7 eggs
  • 1 ½ cups brown sugar firmly packed
  • 3 ½ cups white sugar
  • 1 ½ teaspoon vanilla
  • 1 ½ cups margarine softened to room temp
  • 2 cups peanut butter
  • 1 ½ teaspoon corn syrup or golden syrup
  • 4 teaspoons baking soda
  • 4 cups flour
  • 5 cups rolled oats
  • 2 cups chocolate chips
  • 2 cups Smarties


  • Preheat oven to 350°F/175°C. Prepare baking sheets by spraying with non-stick spray or line with baking paper.
  • Using a mixer, combine eggs, brown sugar, white sugar, vanilla, margarine, peanut butter, corn syrup until whipped evenly.
  • Slowly add the baking soda and flour, mixing with a wooden spoon. Mix in the oats.
  • Add the chocolate chips and Smarties mix throughout.
  • Using an ice-cream scoop, drop a scoop onto the cookie sheet and bake for about 10-12 minutes.
  • Allow cookies to set for 5 minutes before removing them onto a cooling rack.