This is my favorite brownie recipe. If you cannot find Scharffenberger substitute with another premium chocolate. The quality of chocolate makes all the difference.
Heat oven to 325 F. Melt chocolate and butter in a double boiler over simmering water. Stir sugar into chocolate until blended. Add eggs and vanilla. Stir in flour. Spread into a buttered 13" x 9" baking pan. Bake 30-35 minutes or until toothpick inserted in center comes up with crumbs (not batter). Cool in pan.