Chocolate Brownies with Peanut Butter Frosting
Mar 29, 2026
Ingredients:
For the Brownies:
- 1 cup (2 sticks) unsalted butter, melted
- 2 tablespoons vegetable oil
- 1 tablespoon pure vanilla extract
- 1/2 cup unsweetend cocoa powder
- 1 cup sugar
- 1 cup dark brown sugar
- 2 cups all purpose flour
- 1/2 teaspoon salt
- 4 eggs
For the Frosting:
- 1 cup creamy peanut butter
- 1 stick unsalted butter, room temperature
- 2 cups powdered sugar
- 6 tablespoons heavy whipping cream
- chocolate jimmies sprinkles (optional)
Directions:
For the Brownies:
- Preheat the oven to 350F. Grease a jellyroll pan or a 9x13 inch baking pan and line with parchment paper. Set aside.
- In a large bowl, whisk together the melted butter, oil, vanilla and cocoa powder. I like to use an electric mixer for this, but you can also do it by hand, if you prefer.
- Whisk in the sugars, then the flour and salt.
- Whisk in the eggs.
- Pour the batter into your prepared pan in an even layer. Bake for 15-20 minutes if using a jellyroll pan or 25-30 minutes if using a 9x13 inch baking pan. The brownies will look matte across the top with small bubbles when they have finished baking. Allow to cool completely before frosting.
For the Frosting:
- While the brownies are in the oven, start preparing your frosting.Begin by adding the peanut butter and butter to a medium mixing bowl. Beat with an electric mixture for a minute until smooth and well combined.
- Beat in the powdered sugar 1/2 cup at a time. Scrape your bowl as needed to ensure everything is well incorporated. Mix in the vanilla and heavy cream. Beat until light and fluffy.
- Spread the frosting in an even layer over your cooled brownies. You can spread this as thick or as thin as you prefer. Top with the jimmies, if desired. Cut into 20 squares and enjoy!
*Store in an airtight container in the fridge for up to 3 days. If they will be out for 24 hours or less, you can store them at room temperature.
*If you have a hard time making brownies from scratch, this is the best no-fail recipe. Unlike other recipes, it is easy to tell when these are finished baking so it takes all of the guesswork out of the bake time. There is no need for a toothpick test or any extra work. As soon as these develop a matte looking finish across the top, they are done.