These are wonderful brownies. They are absolutely scrumptious, moist, fudgy brownies loaded with walnuts  and mint chips.
Good, quality chocolate always makes a difference in a brownie. Be sure to use real chocolate chips.
3 ounces unsweetened chocolate
1/2 cup butter
1 cup brown sugar
1/2 teaspoon salt
1 teaspoon vanilla extract
2 large eggs
2/3 cup all-purpose or bread flour
1 cup chocolate mint chips
3/4 cup walnut pieces 
Preheat the oven to 350 degrees. Lightly grease an 8 x 8-inch baking pan.
1. Cut the unsweetened chocolate into pieces. Melt the butter in the microwave or a double boiler. Add the chocolate. Let it sit for a minute and then stir. If the chocolate is not completely melted and mixture smooth, return it to the microwave or double boiler and heat until melted and smooth. Stir in the sugar and salt.
2. In a cup or small bowl, whisk the eggs together. Add the eggs and vanilla to the chocolate mixture. Stir until combined.
3. Add the flour. Stir until combined again. Fold in the chocolate chips and nuts.
4. Scrape the batter into the prepared pan. Bake for 20 to 25 minutes or until the brownies test done by sticking a toothpick or knife into the center of the pan. The brownies will be done when moist crumbs cling to the toothpick or knife. Let cool completely before cutting.
Baker’s note: If you are in a hurry to get to your brownies—and who isn’t—stick the pan of brownies in the refrigerator to cool.