3 c  Powdered milk
2 c  Chocolate chips (12 oz)
1 1/2 c  Mini marshmallows.

Put half of the dry milk and half the chocolate chips in a food
processor or blender, whirl till just finely ground. Dump out, repeat
with the rest.

Store in airtight container, after adding marshmallows. Use 1/3 cup
mix per mug boiling water.

Somebody suggested the following options: dash salt to taste add a
vanilla bean to the storage jar cinnamon cardamom nutmeg.