Reese's Peanut Butter Cups Miniatures. Reese's Peanut Butter Hearts. Reese's Peanut Butter Hearts: 150 calories per serving. Reese's Peanut Butter Cups Miniatures: 130 calories per serving. Assortment may vary. www.askhershey.com. www.celebratewithhersheys.com. Questions or comments? www.askhershey.com or 800-468-1714. Visit us at www.celebratewithhersheys.com.