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Preheat oven to 325 degrees
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In a medium pot over low heat, melt the butter and chocolate together. Cool for 10 minutes.
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Stir in the sugar, eggs, and vanilla. Then add the 1/2 cup peanut butter chips.
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Stir in the flour and salt. Pour into an 8x8 greased pan.
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In a small bowl, microwave the peanut butter for 20 seconds, or until it's thin and smooth. Drop the peanut butter in teaspoon-fulls on top of the brownie batter, and swirl it in.
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Sprinkle the remaining chips over the top. Bake for 35 minutes, or until set.