You'll need an 8x8-inch baking tray for this recipe.
2 (one-ounce) squares unsweetened baker's chocolate
1 stick unsalted butter
1 cup sugar
1/2 tsp. vanilla
1/4 cup flour
1/4 tsp. salt
1 cup chopped walnuts
Preheat your oven to 325 degrees F. Generously grease an 8x8-inch pan.
Melt chocolate and butter in a heavy saucepan over low heat.
Remove from heat and stir in sugar.
Add eggs and vanilla and beat well.
Stir in flour, salt and walnuts. Mix well.
Pour into a buttered 8-inch-square baking pan.
Bake at 325° for 30 to 40 minutes.