Dark Chocolate-Peanut Butter Blossom Cookies

Preheat oven to 350 degrees F. Coat 2 baking sheets with cooking spray.

Combine brown sugar, peanut butter, oil, egg and vanilla in a mixing bowl; add water and beat with an electric mixer until smooth. Stir together all-purpose and whole-wheat flours, baking powder, baking soda and salt in a small bowl. Stir the dry ingredients into the brown-sugar mixture just until combined.

Using wet hands, roll the dough between your palms into balls, using about 1 tablespoon for each. Flatten each ball into a 1/2-inch-thick disk. Place 2 inches apart on the prepared baking sheets.

Bake the cookies, one sheet at a time, until golden, 8 to 9 minutes. Immediately press a chocolate piece into each cookie's center. Transfer to a wire rack to cool.