- Preheat the oven to 350 F or 180 C.
- Line a 9 inch x 9 inch square baking pan with butter and dust with flour.
- Tap out the excess flour.
- In a small saucepan, melt :
 1 1/2 Cups Unsalted Butter ( 3 Sticks );
 4 Ounces Bittersweet Chocolate ( 65 percent cocoa or higher );
 over low heat stirring frequently.
- Meanwhile in a stand mixer, beat :
 1 1/4 Cup Granulated Sugar;
 3 Large Eggs;
 1 Teaspoon Vanilla;
 on high until the mixture is creamy, about 3 to 5 minutes.
- You may want to cover the mixer with a towel so it doesn't splatter.
- Add the warm chocolate mixture to the sugar and egg mixture for 30 seconds to
                1 minute until the mix is shiny and creamy.
- Add :
 1/2 Cup Plus 2 Tablespoons All-Purpose Flour;
 Pinch of Salt;
 and pulse the mixer on low just until the flour is mixed in being careful not to
                over mix.
- If you wish to add :
 Toasted Nuts;
 Chocolate Chips;
 Dried Fruit;
 this is the time to do it.
- Spread the batter in the pan and bake for 30 minutes, or until a toothpick
                inserted in the center comes out clean.
- Cool on a wire rack and allow to cool completely before cutting