Microwave Chocolate Cake with Peanut Butter Cream

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Filling (enough for 4 cakes):

1/4 cup heavy cream

1/4 cup creamy peanut butter 

1/4 cup powdered sugar 

1/4 teaspoon vanilla extract 

Cake:

3 tablespoons semisweet chocolate chips

1 1/2 tablespoons unsalted butter 

1 large egg 

2 tablespoons granulated sugar 

1/2 teaspoon vanilla extract 

2 tablespoons cocoa powder 

2 tablespoons all-purpose flour 

1/8 teaspoon baking powder 

1/8 teaspoon kosher salt 

2 to 3 tablespoons marshmallow spread, such as Fluff