In a small saucepan, melt together the butter and chocolate, stirring occasionally. It?s very important to let the mixture cool before using.

Preheat the oven to 350. Butter a 13x9x2-inch baking pan or 9x9x2-inch square baking pan.

In a medium bowl, with an electric mixer at medium speed, beat together the eggs and salt until light and foamy, about 3 minutes. Beat in the butter mixture until blended. Then beat in the sugar and vanilla until well mixed. With a rubber spatula, fold in the flour and pecans. Scrape into the prepared pan.

Bake the 13x9x2-inch pan in the 350 oven until still slightly soft to the touch and a wooden pick inserted in the center comes out with crumbs attached to it, about 30 minutes. Or bake the 9x9x2-inch square pan for 40 minutes. Transfer the pan to a wire rack to cool. Cover and refrigerate until chilled. Then cut into rectangles or squares, as large or as small as you want.