1 1/4 cups flour
1/2 teaspoon salt
1 teaspoon baking powder
1/2 cup (1 stick) butter
1/2 cup peanut butter, plus a few tablespoons
1/2 cup granulated sugar
1/2 cup light brown sugar, packed
1/2 teaspoon vanilla
1 egg
Preheat oven to 375 F.
Sift together flour, salt, and baking powder; set aside. Cream butter, peanut butter, and sugars; beat in vanilla and egg. Stir in flour mixture, blending well. Shape mixture into 3/4-inch balls and place on greased baking sheets.
Flatten each cookie with the tines of a fork and bake for about 10 to 12 minutes.
Note: These would be nice with a bit of melted chocolate on top — either milk or bittersweet — or even a light smear of jam.
Vegans: Substitute Earth Balance for the butter, and use an egg substitute to make these easily vegan-friendly.