Preheat oven to 325°F. Mix both types of chocolate chips and melt them in a double boiler over low heat. Remove from heat and add the sugar, vanilla and salt. Stir well and add one egg at a time. Add the flour little by little and finally the peanuts. Place in a baking pan lined with baking paper and bake for 30 minutes or until a toothpick inserted and comes out clean. Let cool completely before cutting.