Method

1. Preheat oven to 350 deg F (Gas mark 4 or 180 deg C).
2. Line a 13 x 9 in (33 x 23 cm) cake tin with grease proof or other non-stick paper and grease the tin.
3. Melt the butter.
4. Beat eggs with sugar, and add vanilla, flour, cocoa, baking powder, salt (optional) and melted butter.
5. Add chopped nuts.
6. Bake at 350 degrees until a wooden pick inserted in center comes out clean, approximately 20-30 minutes.
7. Cool the cake. Dust with powdered sugar or glace with your favorite chocolate frosting.

Variations

1. Instead of all-purpose flour + baking powder you may use self-raising flour.
2. Instead of eggs you may use 3/4 cup med firm drained tofu (suggested by Jennifer, March 2008)
3. Instead of using nuts use a mars bar. Freeze the bar, smash it and the sprinkle it on top before baking (suggested by Thea, August 2008)