Preheat oven to 375°.
To prepare the muffins, lightly spoon 1 cup all-purpose flour and
whole wheat flour into dry measuring cups; level with a knife.
Combine flours and next 4 ingredients (through salt) in a large
bowl; make a well in center of mixture. Combine banana and next 4
ingredients (through egg) in a bowl; stir well. Add to flour mixture.
Stir just until moistened; fold in walnuts. Place 12 muffin cup liners
in muffin cups. Spoon batter into 12 muffin cups.
To prepare streusel, combine oats and remaining ingredients in a
small bowl. Blend with a pastry blender or 2 knives until mixture
resembles coarse meal. Sprinkle streusel over batter. Bake at 375°
for 22 minutes or until a wooden pick inserted in center comes out
clean.
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