Peanut Butter Marshmallow Fudge Brownies

INGREDIENTS

1/2 cup

boiling water

2 oz

unsweetened chocolate, finely chopped

1/3 cup

unsweetened or Dutch-process cocoa powder

2 1/3 cups

granulated sugar

1/2 cup

vegetable, canola, or other neutral-flavored oil (like avocado or grapeseed)

4 tbsp

butter, melted

large eggs + 2 large egg yolks

2 tsp

vanilla extract

1 3/4 cups

all-purpose flour

1/2 tsp

salt

large marshmallows

4 tbsp

(2 ounces, 1/4 cup) butter

1/4 cup

milk (I use 2%)

1/4 cup

unsweetened or Dutch-process cocoa powder (see note)

1/4 tsp

salt

1 1/2 cups

powdered sugar

1 1/2 cups

(about 13.5 ounces) crunchy or creamy peanut butter