Mother-in-law Susan makes these 3 ingredient lifesavers for every school bake sale. I finally got her secret and the whole pan vanishes instantly.

 These 3-ingredient peanut butter blondies are the kind of back-pocket bake that saves the day when you need something sweet in a hurry. With just peanut butter, brown sugar, and eggs, they come together in minutes and bake into rich, chewy bars with a soft center and a gently crackled top. They have the spirit of old-fashioned pantry baking, where simple staples turn into something far more satisfying than you would expect.

Serve these blondies slightly warm or fully cooled, cut into small squares since they are quite rich. They pair well with cold milk, coffee, or hot tea, and for dessert you can dress them up with a scoop of vanilla ice cream or a few sliced strawberries to balance the deep peanut butter flavor.

3-Ingredient Peanut Butter Blondies

Servings: 9 squares

3-ingredient peanut butter blondies in a glass casserole dish

Ingredients

1 cup creamy peanut butter

1 cup packed brown sugar

2 large eggs

Measured peanut butter, brown sugar, and eggs

Directions

1. Preheat the oven to 350°F and lightly grease an 8-inch glass baking dish or line it with parchment for easier lifting and slicing.

2. In a medium mixing bowl, stir together the peanut butter, brown sugar, and eggs until the mixture is smooth, thick, and fully combined.

Peanut butter blondie batter being mixed in a bowl

3. Spread the batter evenly into the prepared baking dish, smoothing the top with a spatula.

Blondie batter spread in glass baking dish

4. Bake for 20 to 25 minutes, until the top is puffed and lightly golden and the center is just set. Do not overbake if you want a gooey middle.

Freshly baked peanut butter blondies cooling in dish

5. Let the blondies cool for at least 20 minutes before slicing into squares and serving.

Plated peanut butter blondie squares with milk

Variations & Tips

For cleaner slices: Let the blondies cool completely before cutting, and wipe the knife between slices. Chilling the pan briefly also helps if you want very neat squares for a bake sale tray.

Choose the right peanut butter: Regular creamy peanut butter gives the most reliable texture here. Natural peanut butter can work, but if it is very oily or separated, the bars may turn out denser or greasier.

Adjust the bake time: If you prefer a fudgier center, pull the pan from the oven as soon as the middle looks just set. For firmer bars, bake a few minutes longer, but watch closely because the sugar can make them go from perfect to overdone quickly.

Easy add-ins: Even though the base recipe is only three ingredients, you can fold in a handful of chocolate chips, chopped peanuts, or a pinch of sea salt for a little extra contrast without complicating the method.