1.Heat the oven to 400°F. Stir the brown sugar, butter and pecans in a small bowl. 2.Unfold the pastry on a lightly floured surface. Roll the pastry into a 15 x 12-inch rectangle. Cut the rectangle into 20 (3-inch) squares. Press the squares into the bottoms of 20 (3-inch) muffin-pan cups. Place 1 heaping teaspoon pecan mixture in the center of each cup 3.Bake the pastries for 12 minutes or until they're golden brown. Remove the pastries from the pans and let cool on a wire rack. Sprinkle the pastries with confectioners' sugar, if desired.