Preheat oven to 400 degrees. Line 12 muffins cups with paper liners. Combine flour, sugar, oat bran, baking powder, and salt in medium bowl; whisk to blend. Place mashed bananas in large bowl. Stir in soy milk, egg, oil, and lemon juice. Mix in dry ingredients, then blueberries. Divide batter among muffin papers. Bake muffins until tester inserted into center comes out clean, about 20 minutes. Turn muffins out onto rack and cool 10 minutes. Serve warm or at room temperature. * You can replace soy milk with diary milk if desired