Frosted Peanut Butter Bars

There is something irresistibly comforting about a homemade peanut butter bar. These Frosted Peanut Butter Bars combine a soft, chewy peanut butter base with a smooth layer of creamy frosting for a dessert that is rich, nostalgic, and incredibly satisfying. The bars are easy enough for a casual afternoon bake but delicious enough to bring to a party, potluck, holiday gathering, or family dinner.

The peanut butter gives the bars a deep roasted flavor, while the buttery frosting adds just the right amount of sweetness. Once cooled and frosted, the bars become wonderfully tender with slightly crisp edges and a soft center.

Why You’ll Love These Frosted Peanut Butter Bars

These bars are especially appealing because they require simple pantry ingredients and don’t involve complicated decorating or multiple layers of cake. The batter comes together quickly, and everything bakes in one pan.

A few things make this recipe stand out:

• Soft and chewy texture rather than a dry, cakey crumb
• Rich peanut butter flavor throughout the base
• Creamy homemade frosting spread over the cooled bars
• Simple ingredients that are easy to keep on hand
• Easy to cut and serve, making them ideal for gatherings
• Make-ahead friendly, since the flavor develops nicely after resting

Ingredients

For the Peanut Butter Bars

• 1 cup unsalted butter, softened
• 1 cup creamy peanut butter
• 1 cup granulated sugar
• 1 cup packed light brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• ½ teaspoon salt

For the Frosting

• ½ cup unsalted butter, softened
• ½ cup creamy peanut butter
• 3 cups powdered sugar
• 1 teaspoon vanilla extract
• 3–5 tablespoons milk, as needed
• Pinch of salt

For the best texture, use regular creamy peanut butter rather than a very runny natural peanut butter. Natural varieties can separate and may produce a different consistency in the finished bars.

Step-by-Step Method

Step 1: Prepare the Baking Pan

Preheat your oven to 350°F (175°C).

Grease a 9 × 13-inch baking pan or line it with parchment paper, leaving a little overhang on the sides. The parchment makes it much easier to lift the cooled bars from the pan before cutting.

Set the prepared pan aside while you make the batter.

Step 2: Cream the Butter and Peanut Butter

Add the softened butter and peanut butter to a large mixing bowl.

Using a hand mixer or stand mixer, beat them together until the mixture is smooth and creamy. This usually takes about 1–2 minutes.

Creaming the two ingredients well helps distribute the peanut butter evenly throughout the batter and gives the finished bars a tender texture.

Step 3: Add the Sugars

Add the granulated sugar and brown sugar to the peanut butter mixture.

Beat again until the mixture becomes lighter and fluffy, scraping down the sides of the bowl if necessary.

The brown sugar contributes moisture and a subtle caramel-like flavor, while the granulated sugar helps create the slightly crisp edges that make these bars so enjoyable.

Step 4: Add the Eggs and Vanilla

Add the eggs one at a time, mixing well after each addition.

Then add the vanilla extract and mix until everything is evenly incorporated.

Avoid overmixing at this point. Once the eggs disappear into the mixture, you’re ready for the dry ingredients.

Step 5: Combine the Dry Ingredients

In a separate bowl, whisk together:

• All-purpose flour
• Baking soda
• Salt

This small step helps distribute the baking soda and salt throughout the flour so you don’t end up with concentrated pockets of either ingredient.

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