In a large bowl, whisk together the flour, baking soda, baking powder and salt. Stir in the oats.
In a medium bowl, whisk the melted butter and brown sugar together until smooth & combined. Whisk in the vanilla, peanut butter and then the egg until well incorporated. Pour the wet ingredients into the dry ingredients and gently mix together with a wooden spoon or spatula until just combined. Fold in the white chocolate chips and M&M's reserving 1/4 cup of each for topping if desired. Place dough in the fridge to chill for 30 minutes.
Once dough is chilled, preheat oven to 350 F degrees. Line two cookie sheets with parchment paper or silicone baking mats.
Using a large cookie scoop or measure and roll 2-1/2 tablespoon size cookie dough balls. Place about 8 balls onto prepared cookie sheet.
Bake in preheated oven for 10-12 minutes for a soft and underbaked cookie. they will continue to bake on the cookie sheet. Press a piece or two of the remaining chocolate chips and M&M's into each cookie if desired. Cool on the cookie sheet for 10 minutes before transferring to a wire rack.
Soft and Chewy Oatmeal Monster Cookies
Amount Per Serving (2 cookies)
Calories 293Calories from Fat 135
% Daily Value*
Saturated Fat 7g35%
Vitamin A 255IU5%
Vitamin C 0.1mg0%
* Nutrition facts are provided as a courtesy using the WPRM recipe calculator. It is best to make your own calculations to ensure accuracy. We expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website. Percent Daily Values are based on a 2000 calorie diet.