1 cup butter, softened
1 cup light brown sugar
1 egg yolk
1 teaspoon vanilla
1/4 teaspoon salt
2 cups unsifted flour
1 package semi-sweet chocolate chips (6 ounces)
3/4 cup walnuts, coarsely chopped
Pre-heat the oven to 350°F.
Grease a 13-inch x 9-inch inch pan. Beat the butter and sugar until light and fluffy. Add the egg yolk, vanilla and salt and mix until thoroughly combined. Beat in the flour and mix until just combined.
Turn the batter into the pan, evening it out by pressing it with a sheet of wax paper to help your hands from sticking.
Bake for 22-25 minutes, or until golden brown. Remove from the oven and immediately sprinkle with chocolate chips. Let the chocolate chips sit for a few minutes to soften, then spread with a rubber spatula until they form a smooth, even chocolate layer. Sprinkle nuts evenly on top.