Chocolate Walnut Pie Bars

Crust
1 1/2 cups all-purpose flour
1/2 cup (1 stick) butter or margarine, softened
1/4 cup packed brown sugar

Filling
3 large eggs
3/4 cup light corn syrup
3/4 cup granulated sugar
2 tablespoons butter or margarine, melted
1 teaspoon vanilla extract
2 cups (12 ounces) NESTL? TOLL HOUSE