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Heat oven to 375°F Spray bottoms only of 8 (10 oz) ramekins with cooking spray.
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In saucepan, heat chocolate, butter and coffee over low heat, stirring constantly, until melted and smooth; cool slightly.
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In medium bowl, beat 4 egg whites with electric mixer on high speed until stiff peaks form; set aside.
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In another medium bowl, beat egg yolks and yogurt on medium speed until blended. Gradually beat in granulated sugar, brown sugar and chocolate mixture.
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Stir in flour, cocoa and cinnamon just until blended.
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Fold in egg whites.
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Spoon into ramekins.
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Bake 20 to 22 minutes or until firm to the touch. Cool 5 minutes (centers of cakes will sink slightly). Remove from ramekins to cooling rack. Cool 15 minutes.