1. Heat oven to 375°F.
2. Beat butter, brown sugar and granulated sugar in large bowl until fluffy. Add egg and vanilla; beat well. Add flour and baking soda; blend well. Stir in 1 cup baking pieces and nuts; press into ungreased 13x9x2-inch baking pan. Sprinkle with remaining 3/4 cup chocolates.
3. Bake 22 to 25 minutes or until golden brown. Cool completely in pan on wire rack. Drizzle VANILLA GLAZE over top; allow to set. Cut into bars. Makes about 24 bars.
VANILLA GLAZE: Combine 1 cup powdered sugar, 2 tablespoons milk and 1/2 teaspoon vanilla extract in small bowl; stir until smooth. About 1/3 cup glaze.