Chocolate-filled Cream Puffs

0.5 cup butter
1 cup water
1 cup flour
4 eggs
1 cup chocolate chips
0.5 cup milk
0.5 cup sugar
1 lb marshmallows
1 tsp vanilla
1 cup whipped cream

**Cream Puffs:**
Melt butter in boiling water, then lower heat. Add flour all at once (important) stirring rapidly. Cook and stir until mixtures smoothly around spoon. Remove from heat. Add eggs, one at a time, beating thoroughly after each addition. Keep beating until mixture looks satiny and breaks off when spoon is raised. Drop by spoonfuls on ungreased cookie sheet making 12 large or 18 medium puffs. Bake at 425 degrees for 30 minutes or until puffed, dry and golden brown. Cool. Cut part way through, crosswise and fill.

**Chocolate Filling:**
Put chocolate chips, milk, sugar and marshmallows in top of double boiler. Cook over hot water, stirring occasionally, until mixture is smooth. Remove from heat. Add vanilla and chill. Fold in whipped cream and fill puffs. Place in freezer until firm.