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Some cookies are just meant to be soft, chewy, and packed with flavor—and these Reese’s Pieces Oatmeal Cookies check every box! Think of them as the best parts of an oatmeal cookie and a peanut butter candy explosion, all in one bite. The oats bring chewy texture, the brown sugar adds deep caramel notes, and those crunchy, peanut buttery Reese’s Pieces take them to the next level.

If you love the classic combination of peanut butter and chocolate, these cookies will be dangerously addictive. And the best part? No fussy ingredients, no chilling time—just mix, bake, and enjoy.

Why You’ll Love This Recipe:

✔️ Chewy & Crispy – Soft in the center, lightly crisp around the edges.
✔️ Loaded with Peanut Butter Flavor – Thanks to Reese’s Pieces in every bite.
✔️ Easy to Make – No chilling required, just mix and bake!
✔️ Perfect Balance of Sweet & Salty – The brown sugar and oats keep things rich and satisfying.
✔️ Great for Any Occasion – Whether it’s a bake sale, a cookie swap, or just because.

If you’re a peanut butter lover, these are about to be your new favorite cookies…

Ingredients

Butter (or your preferred shortening)
Light brown sugar
Granulated sugar
Egg
Vanilla extract
All-purpose flour
Baking soda
Salt
Milk
Rolled oats
Reese’s Pieces

Step-by-Step Instructions for Making Reese’s Pieces Cookies

Looking for the printable recipe card? I’ve included that at the bottom of this post, and it’s complete with ingredients, measurements, and instructions. Here, I’m going to walk through the steps and include some handy photos to demonstrate the key parts of the process…

Preheat the heat oven to 350°f. Lightly grease a baking sheet.
Add the butter, brown sugar, and granulated sugar to a large bowl, and beat until fluffy. Then beat in the egg and vanilla extract.

Stir the flour, baking soda and salt in a small bowl.
Alternate beating in the flour mixture, then milk to the sugar mixture.

Stir in the oats and Reese’s Pieces.

Drop heaping spoonfuls of dough onto the prepared baking sheet, then gently press down.

Bake for 13-15 minutes or until lightly browned.
Allow to cool for 10 minutes on the baking sheet, then transfer to a wire rack to cool completely.
Serve, and enjoy!

Variations & Customizations for Reese’s Pieces Oatmeal Cookies

Want to switch things up? These chewy, peanut buttery oatmeal cookies are easy to customize! Try one of these fun variations to make them your own:

Chocolate Lovers’ Edition

Chocolate Chips – Add ½ cup of semisweet or milk chocolate chips for extra richness.
Double Chocolate – Swap ¼ cup of the flour for cocoa powder for a chocolate-oatmeal twist.
White Chocolate Reese’s Cookies – Use white chocolate chips instead of traditional chocolate for a creamy contrast.

Extra Peanut Butter Goodness

Peanut Butter Drizzle – Melt peanut butter and drizzle it over the cooled cookies for an extra hit of flavor.
Chopped Peanuts – Stir in ¼ cup of roasted peanuts for even more crunch.

Texture & Mix-In Upgrades

Coconut & Reese’s Cookies – Add ½ cup of shredded coconut for a tropical twist.
Pretzel Crunch – Toss in ¼ cup of crushed pretzels for a salty-sweet contrast.
Raisin Oatmeal Twist – Keep things classic by adding raisins along with the Reese’s Pieces.

Fun Serving Ideas

Ice Cream Sandwiches – Sandwich a scoop of vanilla or peanut butter ice cream between two cookies.
Dipped in Chocolate – Dip half of each cookie in melted dark chocolate and let it set.