Whisk both sugars, vegetable oil, butter, and cocoa powder in a small pot over low heat. Remove from heat once the butter is melted and the mixture is smooth.
Whisk in the eggs, vanilla extract and salt until well combined. Fold in the all-purpose flour until almost combined. Then fold in the chocolate chips until just combined.
Place a drop of white chocolate ganache on each brownie then top with a marshmallow. Next, cover each marshmallow with ganache. Let set then use icing to decorate the snowmen faces.