Reese’s Peanut Butter Oatmeal Cookies

Tastes of Lizzy T participates in affiliate advertising programs. We may earn a commission when you make a purchase through links on our site.

These thick, no flour peanut butter oatmeal cookies are full of Reese’s Pieces and peanut butter cups, with some peanuts thrown in for a little crunch! 


Before we started this recipe website, I hated nuts. I didn’t even like peanuts very much, which of course is closely related to peanut butter. Now I like a variety of nuts. I like almonds, pistachios, peanuts, and sometimes walnuts. I like to incorporate nuts into my recipes once in awhile, but I’m not going to go as far as saying they’re anything like smooth peanut butter and chocolate.


My dad, however, loves nuts and always wants me to throw some nuts, any kind of nut,  in my cookies.  I decided to surprise him with some of his favorite cookies, peanut butter oatmeal cookies…nuts included.


Speaking of peanut butter and chocolate, what’s your favorite thing to put in cookies? One of my favorites is Reese’s Pieces.  And not only do these peanut butter oatmeal cookies have Reese’s Pieces, but they have my FAVORITE type of candy that consists of peanut butter and chocolate. Yes, you guessed it- Reese’s Peanut Butter Cups.

That’s probably not surprising.

This fantastic peanut butter oatmeal cookie recipe is my mix of Reese’s world and oatmeal-nut world.  The peanuts inside along with the Reese’s just makes this cookie a Triple Threat…bursting with peanut butter chocolate goodness. And, you can never go wrong with oats. It makes for a soft, chewy, thick, perfect cookie.


The simplicity of these peanut butter oatmeal makes it stand out. There’s no need to refrigerate the dough before baking.  Just whip them up and bake them, and you’ll be eating the crunchy nuttiness, soft oatmeal,peanut butter and chocolate cookie in no time.

They also make a big batch and freeze really well.  When you pull these out of the freezer and let them defrost, they’ll be just as soft as if you never had frozen them.

What could be better for a loaded oatmeal cookie lover??


Mmmm…just look how thick those are!

Other Oatmeal Cookie Recipes


Reese's Peanut Butter Oatmeal Cookies

4.50 from 2 votes
These thick, no flour peanut butter oatmeal cookies are full of Reese's Pieces and peanut butter cups, with some peanuts thrown in for a little crunch!
Servings 60 cookies
Prep Time 20 minutes
Cook Time 10 minutes
Total Time 30 minutes


  • 1 cup butter softened
  • 2 cups granulated sugar
  • 2 cups packed brown sugar
  • 3 cups creamy peanut butter
  • 6 large eggs
  • 1 1/2 teaspoons corn syrup
  • 1 1/2 teaspoons vanilla extract
  • 4 teaspoons baking soda
  • 9 cups quick cooking oats
  • 2 cups chopped Reese's peanut butter cups
  • 2 cups Reese's pieces
  • 1 1/4 cups peanuts


  • Preheat oven to 350 degrees.
  • In a large bowl, cream together the butter, sugars, and peanut butter until smooth.
  • Beat in the eggs, two at a time.
  • Stir in the corn syrup and vanilla.
  • Mix in baking soda and oats until well blended.
  • Stir in the Reese's peanut butter cups, Reese's Pieces and peanuts.
  • Use an ice cream scoop to put about 2 inch balls on a cookie sheet. If you like a flat cookie, flatten the dough slightly. If you'd like the cookie thick and rounded, just leave the dough in a ball.
  • Bake for 10 to 12 minutes at 350 degrees.
  • After cooling for a few minutes on the cookie sheet, transfer them to wire racks to cool completely.
  • Store in an airtight container.


Drizzle the tops of these with some melted chocolate chips if you want to make them look even prettier! Simply melt 2 cups of chocolate chips in the microwave at low temperature, stirring often so the chocolate doesn't burn. Use a spoon to drizzle chocolate over top the cookies. Allow the chocolate to set completely before storing them.


Calories: 263kcal | Carbohydrates: 29g | Protein: 6g | Fat: 14g | Saturated Fat: 5g | Cholesterol: 26mg | Sodium: 180mg | Potassium: 189mg | Fiber: 2g | Sugar: 19g | Vitamin A: 120IU | Calcium: 29mg | Iron: 1.1mg
Course Cookies, Dessert
Cuisine American
Calories 263

Reese’s Overloaded Peanut Butter Cookies

About Julie Clark

I'm Julie Clark, CEO and recipe developer of Tastes of Lizzy T. With my B.A. in Education and over 30 years of cooking and baking, I want to teach YOU the best of our family recipes.

Get 5 Classic Recipes with a Deliciously Secret Twist

You might also like

Join the Discussion

Notify of

Most Voted
Newest Oldest
Inline Feedbacks
View all comments

3 years ago

5 stars
Lizzy T obviously knows what she is doing! These are by far the best fluffiest peanut butter oat cookies and like the large quantity it makes!

5 years ago

I can’t thank you enough for sharing this delicious rec.
These are hands down the most amazing pb oat cookies !

7 years ago

These look Awesome! Thanks and pinned.