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Preheat oven to 350F. Grease and flour a 13 by
18 by 1 1/2-inch
sheet pan. Melt together the butter, chocolate
chips, and
unsweetened chocolate on top of a double boiler.
Cool slightly.
Stir together the eggs, instant coffee, vanilla
and sugar. Stir in
the warm chocolate mixture and cool to room temperature.
Stir together the flour, baking powder and salt.
Add to cooled
chocolate mixture. Toss the walnuts and chocolate
chips with flour
to coat. Then add to the chocolate batter. Pour
into prepared pan.
Bake for about 30 minutes, or until tester just
comes out clean.
Halfway through the baking, rap the pan against
the oven shelf to
allow air to escape from between the pan and the
brownie dough. Do
not overbake! Cool thoroughly, refrigerate well
and cut into squares.