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In a medium mixing bowl, combine flour, cocoa powder, baking soda and salt.
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Set aside.
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In a very large mixing bowl, beat butter with an electric mixer on medium speed for 30 seconds.
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Add the sugar and beat mixture till combined, scraping sides of bowl occasionally.
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Beat in egg, water and vanilla till combined.
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Beat in as much of the flour mixture as you can.
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Using a wooden spoon, stir in any remaining flour mixture and the rolled oats.
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Stir in chocolate pieces and peanut butter pieces.
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Drop dough by rounded tablespoon 2 inches apart on an ungreased cookie sheet.
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Bake in a 350 oven for 10 to 12 minutes or till the edges are set.
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Transfer cookies to a wire rack and cool.