Servings: 12 bars
If you love the rich, comforting flavor of peanut butter cookies but want to skip the tedious process of scooping and rolling individual dough balls, these 3-Ingredient Peanut Butter Cookie Bars are the perfect solution. Made with just creamy peanut butter, brown sugar, and eggs, they come together in one bowl and bake into a single, glorious pan of chewy, peanut-buttery goodness.
They have everything you love about a classic peanut butter cookie—the deep roasted flavor, the soft, chewy texture, and that slightly crackled top—but in a fuss-free bar form. They are perfect for lunchboxes, after-school snacks, or a quick dessert when a craving hits.
Why This Recipe Works
This recipe relies on the natural structure and fat content of peanut butter to hold the bars together, eliminating the need for flour or leavening agents. The packed brown sugar not only sweetens the bars but also adds a wonderful molasses-like depth and helps create that soft, chewy texture. The eggs act as the binder, holding everything together while providing moisture. The key to success is pulling them out of the oven just as the edges set, ensuring the center stays delightfully soft and gooey.
Ingredients
- 1 cup creamy peanut butter
- 1 cup packed brown sugar
- 2 large eggs
Directions
- Preheat the oven to 350°F and lightly grease an 8-inch square glass baking dish.
- In a medium mixing bowl, stir together the creamy peanut butter, brown sugar, and eggs until the mixture is smooth, thick, and fully combined.
- Spread the batter evenly into the prepared baking dish, smoothing the top with a spoon or spatula.
- Bake for 20 to 25 minutes, until the top is lightly crackled and the edges are set. Do not overbake if you want chewy bars.
- Let the bars cool completely in the pan before cutting into squares and serving.
Tips for the Best Results
Use shelf-stable peanut butter. Natural peanut butter that requires stirring often has an inconsistent texture and can make the bars greasy. Standard creamy peanut butter works best for this recipe.
Pack the brown sugar. When measuring the brown sugar, press it firmly into the measuring cup. Loosely scooped sugar will result in bars that are less sweet and more crumbly.
Don’t overbake. The bars are done when the edges look set and the top is lightly crackled. The center will still look soft—that’s exactly what you want for a chewy bar. They will continue to firm up as they cool.
Cool completely before cutting. Warm bars are fragile and will fall apart when sliced. Wait until the pan is completely cool for clean, neat squares.
Add a little flair. While this is a 3-ingredient recipe, a pinch of sea salt sprinkled on top before baking, a teaspoon of vanilla extract, or a handful of chocolate chips folded into the batter are all fantastic additions.
Storage and Serving
Store the bars in an airtight container at room temperature for up to 4 days. You can also refrigerate them for a firmer, chewier texture. They freeze beautifully too—wrap individual bars tightly and freeze for up to 3 months. Serve them on their own as a quick snack or dessert, or crumble them over vanilla ice cream for a delicious sundae.
Simple, chewy, and packed with peanut butter flavor, these 3-Ingredient Peanut Butter Cookie Bars are proof that the best recipes often require just a handful of ingredients.