Reese's Peanut Butter Earthquake Cake

Ingredients:

1 box chocolate cake mix + ingredients to prepare

1/2 cup butter, melted

8 ounces cream cheese, softened

1 cup powdered sugar

1 teaspoon vanilla extract

1 cup creamy peanut butter

1/2 cup mini Reese's peanut butter cups, halved

1/2 cup chocolate chips