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Heat oven to 350 degrees.
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Grease a 11 x 17 inch sheet cake pan.
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In large sauce pan, melt butter; add peanut butter, stir until peanut butter is melted.
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Stir in sugar and vanilla, remove from heat.
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Lightly beat eggs in a bowl and add to mixture in pan, if it is cool enough.
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In seperate bowl whisk together flour, baking powder and salt.
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Add flour to batter in pan and beat well with spoon.
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Remove 3 1/2 cups of batter to another bowl and stir into it the 1/2 cup cocoa.
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Spread chocolate batter into cake pan.
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Spread the peanut butter batter over top and swirl with the back of a small spoon.
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Bake 30 minutes or until just done.
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Cool in pan then cut into small squares as they are rich.
