Mix sugar, cocoa and honey together in small saucepan.
Slowly add whipping cream, stirring well.
Bring to a simmer on the stove, stirring frequently.
Add half the mixture to 6 oz. of coffee.
Top with marshmallows.
If you prefer, you can omit the sugar and add extra honey. Milk, almond milk, soy milk, etc. can all be substituted for the heavy cream. Your drink won't be as rich and "s'more-like", but it will still be delicious!