1. Preheat oven to 325F. Melt butter and chocolate squares in a medium saucepan, stirring well. Let cool. Add sugar, eggs, and vanilla. Beat vigorously. Add flour, salt and chopped pecans. Stir well. Pour mixture into buttered 10-inch oven-proof or cast-iron skillet (or 4 6-inch skillets). Bake 30-40 minutes or until knife inc enter comes out clean. Let cool.
2. To prepare frosting, beat butter and cream cheese until light and fluffy, about 3 minutes. Add powdered sugar and cocoa. Beat well. Spread over cooled brownies. Sprinkle with sea salt. Serves 8 .