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Preheat oven to 350 degrees.
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Grease a 9x13-inch baking pan.
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In a medium saucepan, heat the brown sugar and butter'til butter is melted.
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Dissolve the instant coffee in hot water and add to butter mixture.
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Remove from heat and cool to room temperature.
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While butter mixture is cooling, whisk eggs and Kahlua together in a mixing bowl.
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In another bowl sift together flour, baking powder and salt.
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Add the butter mixture and Kahlua mixture to the flour mixture and mix'til just combined.
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Fold in the chocolate and nuts.
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Spread in prepared baking pan and bake 35-40 minutes or'til golden brown.
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Remove from oven and cool slightly before cutting in squares.
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Serving suggestion: Serve warm with ice cream or drizzled with your favorite chocolate sauce.