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Preheat oven to 350F (180C).
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FIRST LAYER: Grease 8 inch square cake pan with butter.
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Mix together thoroughly flour, confectioner's sugar (icing sugar), softened butter and coffee dissolved in hot water.
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(You can use food processor or electric mixer).
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Press mixture evenly into pan bottom.
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Bake 10 minutes in preheated 350F (180C) oven.
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Cool on wire rack.
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SECOND LAYER: Meanwhile in large bowl, combine confectioner's sugar (icing sugar), 1 tablespoon coffee crystals dissolved in 2 tablespoons hot water, softened butter and 1 egg (lightly beaten with a fork at room temperature.)
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Mix until thoroughly combined.
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(can use food processor or electric mixer).
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Put milk in pot over medium heat and scald (heat until bubbles appear around sides but milk is not a rolling boil).
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Add mixture from bowl and heat 7 minutes over medium heat, stirring frequently at first, constantly after the mixture bubbles.
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(If mixture starts to stick on bottom, lower heat slightly).
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Let cool slightly, then pour over first layer.
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Tilt pan to cover base layer evenly.
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Chill in refrigerator half an hour or more until set.
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THIRD LAYER: Combine 4 oz white chocolate with 1 tablespoon butter in double boiler and melt (or melt 1 -1 1/2 minutes in microwave on High and stir ).
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Spread over chilled second layer with spatula or blunt knife (layer will be quite thin).
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OPTIONAL MARBLED EFFECT: Melt 2 oz semisweet chocolate in double boiler (or in microwave 1 to 1 1/2 minutes on High and stir).
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Pour melted semisweet chocolate into small ziploc bag and seal.
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Snip corner of bag with scissors.
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Squeeze out horizontal lines of semisweet chocolate onto white chocolate layer.
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With a blunt knife, swirl the two chocolates together to create a marbled effect.
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Chill.
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Before the third layer is completely set, score into bars.
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VARIATION: Mocha Squares: substitute semisweet chocolate for white chocolate (this variation is easier as the middle layer and semisweet chocolate are similar in colour.)
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MAKES: approx 32 bars (they are very sweet, therefore the bars should be quite small)
