Heat oven to 375°F. Grease 18 muffin cups. In large bowl, combine margarine and brown sugar; beat until fluffy. Add bananas, egg product, milk and vanilla; blend well.
Add all-purpose flour, whole wheat flour, wheat germ, baking powder and baking soda; stir just until dry ingredients are moistened. Fill greased muffin cups 2/3 full. Sprinkle walnuts evenly over batter in cups.
Bake at 375°F. for 20 to 25 minutes or until toothpick inserted in center comes out clean. Cool 5 minutes; remove from pan. Serve warm.