Giant Swiss Cake Roll

INGREDIENTS

3/4 cup

all-purpose flour

1/4 cup

dark or dutch processed cocoa powder

1/2 tsp

baking powder

1/2 tsp

baking soda

1/2 tsp

kosher salt

large eggs, room temperature

3/4 cup

granulated sugar

1 tsp

vanilla extract

1/2 tsp

instant espresso powder

1/4 cup

unsalted butter, cut into cubes

2 oz

dark chocolate (60-70%), finely chopped

6 tbsp

unsalted butter, room temperature

2 tbsp

unflavored vegetable shortening, room temperature

8 oz

marshmallow fluff

1 cup

powdered sugar, sifted (more as needed)

1/4 cup

heavy cream

4 oz

dark chocolate (60-70%), finely chopped

3/4 cup

heavy cream

1 tbsp

salted butter, cut into cubes