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1
In a large mixer bowl, beat the butter or margarine and brown sugar with an electric mixer till combined. Add the egg yolk; beat well. Stir in flour and salt, mixing well.
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2
With floured hands, press the dough into the bottom of a greased 13x9 baking pan. Bake in a 350-degree oven for 15 to 20 minutes or till light brown. Remove pan from the oven; transfer to a wire rack while preparing the filling.
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3
To make the filling, in a medium heavy saucepan, heat the condensed milk and butter over medium heat till bubbly, stirring constantly. Cook and stir for 5 minutes more. Mixture will thicken and become smooth. Stir in the vanilla.
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4
Spread filling over the baked layer. Bake for 12 to 15 minutes or till top is golden. Sprinkle the baked layers evenly with chocolate pieces; bake for 1 to 2 minutes more or till chocolate pieces are shiny and melted.
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5
Remove from oven; transfer to a wire rack. Using a flexible spatula, immediately spread the chocolate evenly over the baked layer. Sprinkle bars with brickle pieces or pecans. Cool completely.
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6
Cover and chill till chocolate is set. For triangles, cut into rectangles (about 3x2 inches each), then cut diagonally. These may be frozen for up to 3 months. Makes about 36 bars.
