Giant Peanut Butter Oatmeal Cookies – Peanut Butter Cookies with Oats and Reese’s Pieces

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Giant Peanut Butter Oatmeal Cookies aren’t just giant, they are monstrous. Made with rolled oats and Reese’s Pieces, these peanut butter cookies are a real treat.

Giant Peanut Butter Oatmeal Cookies

I’m in love with anything peanut butter, and in my book, the bigger the better. That’s why I love these giant peanut butter cookies.

Giant cookies always remind me of going to the mall when I was younger. It was always a treat to stop at the food court cookie shop for a giant chocolate chip cookie!

Peanut Butter Cookies with Oats and Reese’s Pieces

My dear friend Katy inherited a collection of old cookbooks when she recently purchases a new house. The previous owner passed away, and most of her possessions came with the house.

Katy is a dear, and knows that I am a vintage cookbook addict, so she passed them on to me.

In the collection was a darling 1986 Christmas Cookie Cook Book. It’s a treasure trove of cookie recipes, perfect for Christmas baking, or baking any of the year for that matter.

That’s where I found the recipe for Peanut Butter Cookies with Rolled Oats.

Peanut Butter Cookies with Oats Instead of Flour

The crazy thing about these cookies is there’s no flour in the recipe.

Instead of flour, regular rolled oats (not instant oats) are used. The recipe calls for 4 1/2 cups of rolled oats which is a lot, but there’s no flour whatsoever in the recipe.

They are similar to a monster cookie, like this recipe using leftover candy, that doesn’t have flour in it either.

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Ingredient List for Chewy Peanut Butter Oatmeal Cookies

Butter, softened

Sugar

Brown Sugar

Eggs

Peanut Butter

Vanilla Extract

Light Corn Syrup

Rolled Oats

Baking Soda

Reese’s Pieces

Walnuts, chopped

How to Make Chewy Peanut Butter Oatmeal Cookies

  1. Preheat oven to 350 degrees F.
  2. Cream softened butter; add both sugars and beat well.
  3. To the creamed mixture, add peanut butter, eggs, vanilla extract and light corn syrup; beat well.
  4. Stir in old fashioned oats, baking soda and salt.  Then, stir in Reese’s Pieces and chopped walnuts.
  5. Spoon dough in 1/4 cup measurements about 4 inches apart on the cookie sheet.  Press the cookie dough into a 3 inch circle.
  6. Bake 12 to 15 minutes. The center of the cookie should be slightly soft.
  7. Cool slightly on the cookie sheet; then remove to a cooling rack.

For the full ingredient amounts and recipe steps for how to make chewy peanut butter oatmeal cookies, scroll to the recipe card at the bottom of this post. 

FAQs About Giant Chewy Peanut Butter Cookies

  • If needed, use margarine instead of butter.  Just be sure to start with it softened to room temperature.
  • Candy such as M&Ms would be a great substitute for Reese’s Pieces, if desired.
  • Omit chopped walnuts, if desired, or try swapping in chopped pecans instead.
  • The cookie batter will be stiff.
  • Use approximately 1/4 cup batter, or the amount that fits in a large cookie scoop or ice cream scoop.
  • Press the cookie batter into a 3-inch circle.
  • Leave plenty of room between the cookies on the cookie sheet; they will spread when baking.
  • Check out our Amazon Store for our favorite kitchen and pantry items.

Peanut Butter Dessert Recipes

Old Fashioned Peanut Butter Balls 

Old Fashioned Peanut Butter Balls is an easy recipe for a plain peanut butter ball.  These classic Christmas candies are also called Buckeye Balls because they resemble an Ohio Buckeye with a peanut butter center covered in chocolate.

Rice Krispies Scotcheroos 

Rice Krispies Scotcheroos are a no bake treat with Rice Krispies, chocolate and peanut butter. Chocolate Scotcheroo Bars are the best.

Homemade Peanut Butter Pie from Scratch

Old Fashioned Peanut Butter Pie is a from scratch pudding pie that has a decadent peanut butter flavor and smooth, creamy texture.  Homemade peanut butter pie from scratch is easy as pie. You may never buy a boxed pudding mix again after making this easy pudding filling.

Peanut Butter Trifle 

Peanut Butter Cornflake Drop Cookies

Peanut Butter Cornflake Drop Cookies contain 4 simple ingredients transformed into a no bake cookie sensation.  You too can conquer these easy, chewy cookies with a perfectly peanut butter flavor, in approximately 10 minutes flat. 

Giant Peanut Butter Oatmeal Cookies - Peanut Butter Cookies with Oats and Reese's Pieces

Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.
Prep Time10 minutes
Cook Time12 minutes
Total Time22 minutes
Course: Dessert
Cuisine: American
Keyword: chewy peanut butter oatmeal cookies, giant peanut butter oatmeal cookies, peanut butter cookies with oats and reese's pieces
Servings: 30 cookies
Calories: 293kcal
Author: Barbara

Ingredients

  • 1/2 cup softened butter
  • 1 cup white sugar
  • 1 cup brown sugar (plus 2 additional tablespoons)
  • 3 eggs
  • 2 cups peanut butter
  • 1/4 teaspoon vanilla extract
  • 3/4 teaspoon light corn syrup
  • 4 1/2 cups old fashioned oats
  • 2 teaspoons baking soda
  • 1/4 teaspoon salt
  • 1 cup candy coated peanut butter pieces (Reese's Pieces)
  • 1 cup chopped walnuts

Instructions

  • Preheat oven to 350 degrees F.
  • Cream softened butter; add white and brown sugars and cream well.
    Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.
  • Add eggs, peanut butter, vanilla extract and light corn syrup and beat well.
    Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.
  • Stir in oats, baking soda and salt first; and then stir in Reese's Pieces and chopped walnuts.
    Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.
  • Spoon dough, 1/4 cup at at time, approximately 4 inches apart on a cookie sheet. Press the dough into a 3 inch circle with your fingers.
    Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.
  • Bake 12 to 15 minutes. The centers of the cookies should be slightly soft.
    Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.
  • Cool slightly on the cookie sheets, and then remove to wire racks to cool completely.
    Giant Peanut Butter Oatmeal Cookies aren't just giant, they are monstrous. Made with rolled oats and Reese's Pieces, these peanut butter cookies are a real treat.

Notes

  • If needed, use margarine instead of butter. Just be sure to start with it softened to room temperature.
  • Candy such as M&Ms would be a great substitute for Reese's Pieces, if desired.
  • Omit chopped walnuts, if desired, or try swapping in chopped pecans instead.
  • The cookie batter will be stiff.
  • Use approximately 1/4 cup batter, or the amount that fits in a large cookie scoop or ice cream scoop.
  • Press the cookie batter into a 3-inch circle.
  • Leave plenty of room between the cookies on the cookie sheet; they will spread when baking.
  • Love peanut butter?  Try these amazing Peanut Butter Rice Krispies Cookies
  • Please note that the carb counts, calorie counts and nutritional information varies greatly depending on the products you use. The auto-calculation is an automated estimate and should NOT be used for specific dietary needs.

Nutrition

Calories: 293kcal | Carbohydrates: 30g | Protein: 7g | Fat: 17g | Saturated Fat: 5g | Polyunsaturated Fat: 5g | Monounsaturated Fat: 6g | Trans Fat: 0.1g | Cholesterol: 25mg | Sodium: 212mg | Potassium: 198mg | Fiber: 3g | Sugar: 19g | Vitamin A: 119IU | Vitamin C: 0.1mg | Calcium: 32mg | Iron: 1mg

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