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.

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.

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.
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Peanut Butter Dessert Recipes

Old Fashioned Peanut Butter Balls 

Rice Krispies Scotcheroos 

Homemade Peanut Butter Pie from Scratch

Peanut Butter Trifle 

Peanut Butter Cornflake Drop Cookies