Preheat oven to 350 degrees Fahrenheit (175 degrees Celsius).

Combine all brownie ingredients in a large bowl and pour into a nine x 13-inch (20×30-centimeter) baking pan. Bake for 45 minutes or until toothpick inserted inside comes out mostly dry (if there are a few moist crumbs, that’s okay).

While the brownies are baking, prepare the frosting if desired: Mix together frosting ingredients in medium-sized mixing bowl until smooth. Add a few drops of water if it’s too thick, or a bit more confectioners’ sugar if it’s too runny.

Spread frosting over cooled brownies and cut into one- and- a- half-inch (four-centimeter) squares. (You should have 30 squares.)

Skewer five mini marshmallows in a cluster and slide upward.

Add two mini pretzel twists and then stick the skewer into a brownie square.

Heat all sauce ingredients in a small saucepan. Stir until dissolved and allow to simmer for three to four minutes.

Remove from heat and drizzle brownie sticks with sauce. If desired, serve extra fudge sauce in small bowls for dipping.