Place chocolate in double boiler and heat slowly until melted. Once melted, remove from heat and let cool slightly.
While chocolate is cooling, rough chop nuts.
Line a sheet pan with parchment paper.
Place marshmallows into a large bowl. Pour in cooled chocolate, add nuts and gently mix together until well combined.
Pour chocolately marshmallows onto parchment lined pan. Let cool completely.
Using a large knife, cut into pieces.
Store in a covered tupperware style container.