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Oatmeal and Peanut Butter Monster Cookie Squares

These chewy and satisfying cookie squares are packed with hearty oats and creamy peanut butter, making them a perfect snack or treat. Easy to whip up and deliciously wholesome, they’ll quickly become a favorite in your kitchen.

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TIME23 min
SERVINGS4
RATINGNew
Oatmeal and Peanut Butter Monster Cookie Squares
01 / WHAT YOU NEED

Ingredients

02 / HOW TO MAKE IT

Let's cook.

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01

Step 1

Start by heating your oven to 400°F (200°C) and greasing a 9x13-inch baking pan. In a bowl, mix together the brown sugar, butter, corn syrup, 1/4 cup of peanut butter, and vanilla extract until everything is well combined. Slowly add the oats, stirring them in little by little. Press this mixture evenly into the prepared pan.

02

Step 2

Pop it in the oven and bake for about 12 to 14 minutes, or until the edges turn a nice golden brown. Once out of the oven, let it sit for about 4 minutes to cool slightly.

03

Step 3

While that’s cooling, melt the chocolate chips, butterscotch chips, and the remaining 1/3 cup of peanut butter together in a microwave-safe bowl. Heat in 15-second bursts, stirring well after each one until everything is smooth and fully melted—this usually takes around 1 to 3 minutes. Spread this warm, gooey topping over the bars.

04

Step 4

Finally, let the whole thing cool completely for a couple of hours before slicing into squares. This way, the topping will set nicely and won’t be messy when you cut it. Enjoy!

03 / EXTRA DETAILS

Good to know.

Cook's tip

- Use natural peanut butter for a richer, less sweet flavor.
- Press the mixture firmly into the pan to help the squares hold together well.
- Let the bars cool completely before cutting to avoid crumbling.

Why you’ll love it

These squares are a perfect blend of hearty oats and creamy peanut butter, making them both satisfying and delicious. They offer a great balance of chewy and soft textures with a touch of sweetness. Plus, they are easy to make and great for a quick snack or dessert.

Serving ideas

These squares are wonderful on their own or paired with a glass of cold milk. They also make a tasty addition to a packed lunch or an after-school snack. For extra indulgence, serve them with a drizzle of honey or a dollop of yogurt.

Storage & leftovers

Store the squares in an airtight container at room temperature for up to three days. For longer freshness, keep them in the refrigerator for up to a week. You can also freeze them individually wrapped for up to a month—just thaw before serving.

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