These 3-Ingredient Peanut Butter Cookie Bars are soft, chewy, rich, and incredibly easy to make. With just three simple ingredients, you can have a homemade peanut butter dessert ready for the oven in minutes.
They have the familiar flavor of classic peanut butter cookies but are made as easy-to-slice bars, making them perfect for family desserts, lunchboxes, bake sales, or an afternoon treat.
Why You’ll Love This Recipe
- Only 3 ingredients
- Quick and easy preparation
- No complicated techniques
- Rich peanut butter flavor
- Soft and chewy texture
- Perfect for beginners
- Easy to customize
Ingredients
Creamy Peanut Butter
Use regular creamy peanut butter for the smoothest cookie bars. Avoid natural peanut butter if possible, as its separated oils can affect the texture.
Granulated Sugar
Sugar provides sweetness and helps create the slightly crisp edges and chewy center these bars are known for.
Eggs
Eggs bind the ingredients together and help give the bars structure while keeping them tender.
How to Make 3-Ingredient Peanut Butter Cookie Bars
Step 1: Prepare the Oven
Preheat your oven to 350°F.
Line an 8-inch square baking pan with parchment paper, leaving a little overhang on the sides. Lightly grease the parchment.
Step 2: Mix the Ingredients
Add the peanut butter, sugar, and eggs to a medium mixing bowl.
Stir until the mixture is smooth and completely combined. The batter will be thick.
Step 3: Spread the Batter
Transfer the mixture to the prepared baking pan.
Use a spatula or the back of a spoon to spread it evenly into the corners.
Step 4: Bake
Bake for approximately 18 to 22 minutes, or until the edges are lightly golden and the center is set.
Be careful not to overbake. The bars will continue to firm up as they cool.
Step 5: Cool
Remove the pan from the oven and let the cookie bars cool completely in the pan.
Once cool, use the parchment paper to lift them out and cut into squares or bars.
Tips for the Best Peanut Butter Cookie Bars
Don’t Overbake
For soft, chewy bars, remove them from the oven as soon as the center is set. Overbaking can make them dry and crumbly.
Measure the Peanut Butter Carefully
Use the correct amount of peanut butter for the best texture. Too much can make the bars overly soft, while too little can make them dry.
Let Them Cool Completely
The bars become firmer as they cool, so resist the temptation to slice them immediately after baking.
Use Parchment Paper
Parchment makes it much easier to lift the entire batch from the pan and cut neat squares.
Easy Variations
Add Chocolate Chips
Fold chocolate chips into the batter before baking for a classic peanut butter-and-chocolate combination.
Add Chopped Peanuts
Stir in a handful of chopped roasted peanuts for extra crunch.
Add a Chocolate Drizzle
Once cooled, drizzle melted chocolate over the top and allow it to set before slicing.
Sprinkle With Sea Salt
A light sprinkle of flaky sea salt over the baked bars creates a delicious sweet-and-salty contrast.
How to Serve
These peanut butter cookie bars are delicious on their own, but they can also be served with:
- A glass of cold milk
- Vanilla ice cream
- Whipped cream
- Fresh berries
- Chocolate sauce
- A cup of coffee or tea
For an extra-special dessert, warm a bar slightly and serve it with a scoop of vanilla ice cream.
Storage
Store cooled cookie bars in an airtight container at room temperature for up to 4 days.
For a softer texture, keep them well covered so they do not dry out.
Freezing Instructions
These bars freeze well. Allow them to cool completely, then wrap individual portions tightly or place them in a freezer-safe container.
Freeze for up to 2 months.
Thaw at room temperature before serving.
3-Ingredient Peanut Butter Cookie Bars Recipe Card
Prep Time: 5 minutes
Cook Time: 18 to 22 minutes
Cooling Time: 30 minutes
Total Time: About 55 minutes
Servings: 12 bars
Ingredients
- 1 cup creamy peanut butter
- 1 cup granulated sugar
- 1 large egg
Instructions
- Preheat the oven to 350°F.
- Line an 8-inch square baking pan with parchment paper and lightly grease it.
- Combine the peanut butter, sugar, and egg in a mixing bowl.
- Stir until smooth and fully combined.
- Spread the thick batter evenly into the prepared pan.
- Bake for 18 to 22 minutes, until the edges are lightly golden and the center is set.
- Remove from the oven and cool completely.
- Lift the bars from the pan using the parchment paper and cut into squares or bars.
- Serve and enjoy.
Final Thoughts
These 3-Ingredient Peanut Butter Cookie Bars are one of those simple desserts you’ll want to make again and again. They require very little preparation, use pantry-friendly ingredients, and deliver plenty of rich peanut butter flavor in every bite.
Whether you’re looking for an easy weeknight dessert or a quick homemade treat for sharing, this recipe is a wonderfully simple choice.