In a saucepan over low heat, melt butter and marshmallows, stirring constantly until smooth.
Add chocolate chips to the marshmallow mixture and stir until melted and mixed well.
Remove from heat and add the chow mein noodles, stirring to coat.
Plop down spoonfuls of the sticky mixture onto wax paper and shape into round nests. Every nest is unique, so don't worry about getting them perfectly round! Press down the center just a bit to make room for eggs if you want to stuff the nests.
If using candy eggs, press them into the center of the nests and then allow the nests to cool before eating.