On a lightly floured surface, roll each thawed loaf of dough into a 12x8-inch rectangle. (If dough becomes difficult to roll out, let it rest a few minutes.) Brush each rectangle with melted butter. Sprinkle each with the brown sugar mixture, chocolate pieces and 1/2 cup chopped pecans. Roll up each rectangle starting from a long side. Seal seams. Cut each roll crosswise into 6 pieces. Arrange pieces, cut side down, in the prepared dish. Cover with a dry towel. Let rise in a warm place till nearly double (45 to 60 minutes). Break any surface bubbles with a greased toothpick.