Small-batch Homemade Hostess Cupcakes

INGREDIENTS

2 tbsp

unsalted butter

2 tbsp

chopped semi-sweet chocolate (high-quality chips are fine)

1 1/2 tsp

vegetable oil

1/4 cup

all-purpose flour

2 tbsp

cocoa powder (sifted if lumpy)

1/2 tsp

baking powder

1/8 tsp

salt

1/4 cup

granulated sugar

large egg yolk (room temperature)

1/4 tsp

vanilla extract

2 tbsp

milk (any percentage)

2 tbsp

hot coffee (or water)

large marshmallows

1 tsp

corn syrup

1 tbsp

milk

1 tbsp

butter

1 tsp

corn syrup

1/4 cup

chopped semi-sweet chocolate ((high-quality chips are fine))

1/2 cup

powdered sugar (sifted)

1/4 cup

powdered sugar

1/2 tsp

to 1/2 tablespoon milk