Banana-ginger Bran Muffins

• 375 degree oven
• 3 bananas
• 2 egg whites
• 1 lemon (grated)
• 1/2 oat bran
• 220 gr ripe banana
• 110 gr brown sugar (light)
• 95 gr wheat flour (whole)
• 95 gr all purpose flour
• 60 gr crystallized ginger