Filled Chocolate Cupcakes

1 pkg. chocolate cake mix
32 cupcake papers
Chopped walnuts
Powdered sugar

FILLING:

8 oz. cream cheese, softened
1 egg plus 1 egg yolk
Dash of salt
12 oz. chocolate chips

Mix cake as directed; fill cupcake papers 1/3 full. In a separate bowl, combine filling ingredients; drop a heaping teaspoon of filling on each cupcake. Sprinkle with chopped walnuts and powdered sugar. Bake 20 minutes at 350 degrees. Makes 32 cupcakes.