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Beat egg whites with a mixer on medium-high speed until foamy.
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Gradually add 1/4 cup sugar, 1 tablespoon at a time, beating after each addition; beat until peaks form.
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In a separate bowl, beat 1/2 cup sugar with butter on medium speed approximately 5 minutes until well blended.
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Add flour through salt; beat well.
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Add yolks and milk; beat well.
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Stir 1/4 of egg whites into batter, then gently fold in the rest of egg white mixture.
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Spoon into 6 (6 oz) custard cups coated with nonstick cooking spray.
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Place cups in a shallow baking pan and add hot water around cups to a depth of 1 inch.
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Bake at 350° 45 min or until set.
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Remove cups from pan.