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Prepare 12 muffin cups with nonstick cooking spray.
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In a large mixing bowl, using an electric mixer, beat the peanut butter and brown sugar together until blended.
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Beat in the eggs, one at a time; beat well after each addition.
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Beat in the vanilla extract.
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In another large mixing bowl, add the flour, baking soda, and salt; stir to combine.
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Add the dry ingredients alternately with the buttermilk into the peanut butter mixture, beginning and ending with the dry ingredients; stir just until blended after each addition (do not over mix).
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Pour the batter evenly into the muffin cups.
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Sprinkle each muffin with 1 heaping teaspoon of chopped peanuts.
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Bake at 400 degrees for 20-22 minutes or until a pick comes out clean.
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Cool on a wire rack before removing from the pan.