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Combine oats and butter in 2-quart glass Mix-N-Pour bowl.
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Microwave on High, uncovered, 3 to 4 minutes, or until heated through.
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Stir in brown sugar and corn syrup.
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Microwave on High, uncovered, 1 1/2 to 2 1/2 minutes or until heated and sugar is dissolved.
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Turn into greased 10 x 6-inch baking dish.
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Press evenly in dish.
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Place chocolate pieces in 1 cup glass measure.
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Microwave, on High, for 1 1/2 to 2 1/2 minutes or until chocolate is glossy, stirring once.
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Stir until smooth.
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Blend in peanut butter, spread over bars.
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Refrigerate until chocolate is set.
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Cut into squares.
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Makes 24 bars.