Liberally grease a 9x13 cake pan and set aside. Brown the butter in a small, light-colored saucepan (using a dark-colored pan makes it hard to tell the color of the butter as it browns). This should take about ten minutes. Add the butter and 8 cups of the marshmallows to a large pot and allow to melt over medium heat. Add vanilla and salt and stir until completely melted and smooth. Add the cereal and remaining two cups of marshmallows and stir until mixed well. Spread evenly in the cake pan and allow to cool before cutting into cubes. Enjoy! ⁣