Flourless Monster Cookies: Chewy Peanut Butter Oatmeal Cookies

October 5, 2026 Joy the Baker

Flourless Monster Cookies: Chewy Peanut Butter Oatmeal Cookies

These flourless monster cookies are packed with peanut butter, oats, M&M’s, and chocolate chips, with crisp edges and soft, chewy centers. An easy one-bowl monster cookie recipe that’s naturally gluten free and easy to dress up for Halloween, Christmas, or any season!

Monster cookies have always felt appropriately named to me. They’re not  spooky, exactly, but because they’re loaded with just about everything you could want in a cookie. Peanut butter, oats, chocolate chips, candy pieces.

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