Peanut Butter Brownies

I have no idea why these are called brownies. Maybe it's because they're .... brown? I suppose it's because they're made much like brownies (and blondies), but instead of chocolate you use peanut butter. I realize that some people believe it's a cardinal sin to make brownies without chocolate, but if you're going to replace that cocoa crack with something peanut butter is the next best thing!

Peanut Butter Brownies
Adapted from BakeSpace
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Ingredients
1/2 cup smooth or chunky peanut butter
1/3 cup butter
2/3 cup sugar
1/2 cup packed brown sugar
2 eggs
1/2 teaspoon vanilla
1 cup all-purpose flour
1 teaspoon baking powder
1/4 teaspoon salt

Directions
1. Preheat oven to 350 degrees. Prepare 8-inch square baking dish.
2. In a large bowl blend peanut butter and butter until well-mixed. Gradually add sugars, beating until light and fluffy. Add eggs one at a time, mixing well after each addition. Beat in vanilla. Set aside.
3. In a separate bowl whisk the flour, baking powder and salt. Gradually add to butter mixture, stirring well. Pour into prepared baking dish.
4. Bake 25 to 30 minutes, being careful not to overbake because bars will quickly harden.