Preheat oven to 375°F. Grease two standard size muffin tins.
Mash the banana. Wash and chop the rhubarb and strawberries. Chop the hazelnuts (toast them in a dry skillet for a few minutes until lightly browned if time allows). Grate or mince the ginger.
In a large bowl, combine the wheat bran, oat bran, whole wheat flour, baking soda, baking powder, and kosher salt. In a smaller bowl, combine the eggs, milk, yogurt, melted butter, honey, and vanilla; mix well.
Pour the wet ingredients (including banana) into the dry ingredients and mix with a spatula until just combined. Add the strawberries, rhubarb, nuts, and ginger and stir to combine.
Fill the muffin cups with batter. Bake 20 to 25 minutes, until a toothpick inserted in the center comes out clean. Cool the muffins in the pan for a few minutes, then remove them and serve warm or cool fully on a wire rack.