Preheat the oven to 350 degrees Fahrenheit. Melt together the butter and baker's chocolate in a double boiler. (If you don't have a double boiler, nest a small pot with the chocolate and butter in it over a slightly larger pot with boiling water in it).

Stir until completely combined, then remove from heat and allow the mixture to cool down until it is warm, not hot. Stir in the brown sugar, olive oil, cocoa powder, amaretto liqueur, and vanilla extract. Then beat in the two eggs until well blended.

Stir in the flour and 1/4 teaspoon of the salt until completely mixed into the dough. Add the walnuts and most of the chocolate chips and stir again until evenly dispersed.

Pour the mixture into a well-greased 8x8 inch baking pan. Sprinkle the small amount of remaining chocolate chips over the brownies for decoration, as well as the remaining 1/4 teaspoon of salt. Place in the oven and bake for 25 minutes. Remove from the oven and allow to cool for 15 minutes before serving.