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Start by melting your butter in the microwave. Butter should just be melted, not boiling.
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Add sugars, vanilla and salt. Stir to combine.
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Separate your egg and add the yolk only to your cup. Stir to combine.
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Add flour, then stir again. Measure a scant, slightly less than full, 1/4 cup of all-purpose flour.
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Add the chocolate chips, and give a final stir. Now your mixture will look like cookie dough.
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Add Reese's peanut butter cup and press down into dough. Smooth cookie dough over peanut butter cup so it is completely covered.
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Cook in microwave 40-60 seconds, start checking for doneness at 40 seconds. Mine takes 50 seconds.
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Do not cook past one minute, just like a regular cookie, this will continue cooking as it cools.
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If the cookie is dry or cake like, try less time.
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Serve warm with a scoop of vanilla ice cream on top.