Ingredients
- 1 cup (2 sticks) unsalted butter or margarine, room temperature
- 1 cup packed light brown sugar
- 1 egg yolk
- 1 teaspoon vanilla extract
- 2 cups all-purpose flour
- 1 cup (6 ounces) semisweet chocolate pieces
- 1 cup chopped walnuts
Directions
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Preheat oven to 350 degrees.
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Line a 15- by 10-inch jelly-roll pan with foil. In a medium bowl, beat together butter or margarine, brown sugar, egg yolk and vanilla until light and fluffy. Add flour, beating until well blended. Spread mixture evenly in foil-lined pan. Bake 15 to 18 minutes or until golden.
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Sprinkle chocolate pieces evenly over cookie surface. Bake 2 to 3 minutes or until chocolate melts. Remove from oven and let stand 1 minute. With a knife, spread melted chocolate evenly over top.
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Sprinkle with walnuts. While warm, cut into squares. Cool in pan. Store in refrigerator, if desired.
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Makes about 54 cookies.