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Preheat oven to 350 degrees. Line two baking sheet with parchment paper, silpats, or coat with non-stick cooking spray.
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In a medium bowl, put the peanut butter, brown sugar, and egg. Use a rubber spatula to mash and stir the ingredients into a smooth batter. Add the chocolate, and stir again until evenly distributed.
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Pinch up a tablespoon of dough and roll in the palms of your hands into a smooth ball. Cover each baking sheet with 12 balls. Press a fork firmly into the dough, first in one direction, and then the opposite direction. If the dough crumbles a bit, just patch it back together.
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Bake until the cookies brown slightly and you start to see a hint of a darker rim around the cookie, 10 to 12 minutes.
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Remove from oven and cool. Store in an air-tight container.