Slow-Cooker Reese's™ Peanut Butter Cup Swirl Cake

Name: Slow-Cooker Reese's™ Peanut Butter Cup Swirl Cake
Prep time: 20 min
Total time: 20 min
Cuisine: American
Ingredients: 1 box Betty Crocker™ Super Moist™ Yellow Cake Mix; 1 cup water; 3 eggs; 1/2 cup creamy peanut butter; 1/3 cup butter, softened; 1/2 cup chocolate-flavored syrup; 3 tablespoons creamy peanut butter; 2 to 3 tablespoons milk; 1 cup powdered sugar; 2 tablespoons chocolate-flavored syrup; 20 Reese's peanut butter cups miniatures, unwrapped and cut in half