Preheat oven to 375. Line a 12-cup muffin pan with paper liners. In a bowl, whisk together flours, wheat germ, baking soda, and salt.
2
In a large bowl, beat butter and sugars until light and fluffy. Add eggs, beating well after each addition. In another bowl, mash bananas with fork; stir in milk and vanilla.
3
With a mixer on low, alternately add floud mixture and banana mixture, beginning and ending with floud mixture; mix until just combined. Fold in frozen blueberries.
4
Divide batter among muffin cups. Bake 25-28 minutes, rotating pan half way through. Let cool 10 minutes in pan; transfer to a rack to cool 10 minutes more.