Preheat oven at 350°F In a double-boiler, melt the first quantity of chocolate (7 ounce) and butter at low heat.
With a mixer, beat eggs, sugar and brown sugar for 2 minutes. Add vanilla and beat well.
Add melted chocolate and beat 1 minute.
Sift the dry ingredients. Add to the chocolate mixture. Add the chopped chocolate and nuts. Fold delicately.
On a baking sheet with parchment paper, put 2 tablespoon of mixture, leaving 1 1/2 inch between each cookies. Flatten lightly.
Bake in the third part of the oven 9 to 11 minutes. The sides will be crunchy and the center still soft. Don’t cook the cookies too much because they will keep on cooking out of the oven, that way they will stay soft when cold. Let them cool a little bit before touching them, then cool completely on a rack.