Beat eggs with a hand beater until thick and lemon colored.
Gradually beat in sugar with a spoon.
Stir in vanilla and chocolate.
Gradually add flour and blend.
Add 1/2 the nuts and pour into a greased or oiled 8" x 8" x 2" pan.
Spread out with a spatula, then sprinkle remaining nuts on top.
Bake in a moderate oven of 350ºF for 25 min.
When cool, cut in 2" squares.