Preheat oven to 375°F. Spray an 8-1/2x4-1/2x2- inch bread pan with nonstick cooking spray.
Combine oat bran flour with baking powder and sugar. Combine the club soda with flour mixture until flour is just moistened. Pour batter into bread pan. Sprinkle with caraway seeds, if desired.
Bake for 45- 60 minutes
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