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Preheat oven to 350°.
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Coat 2 (6-ounce) ramekins with cooking spray; sprinkle each with 3/4 teaspoon granulated sugar.
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Combine 2 tablespoons granulated sugar, flour, cocoa, and milk in a small saucepan over medium heat.
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Cook 2 minutes, stirring until smooth.
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Spoon chocolate mixture into a medium bowl; cool 4 minutes.
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Stir in vanilla.
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Place egg white in a medium bowl; beat with a mixer at high speed until soft peaks form.
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Add remaining 2 tablespoons granulated sugar, 1 teaspoon at a time, beating until stiff peaks form (do not overbeat).
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Gently stir 1/4 of egg white mixture into chocolate mixture; gently fold in remaining egg white mixture.
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Spoon mixture into prepared dishes. Sharply tap dishes 2 or 3 times to level.
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Place dishes on a baking sheet; bake for 15 minutes or until puffy and set.
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Sprinkle each soufflé with 1/2 teaspoon powdered sugar.
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Serve immediately.