How to Make It
Preheat oven to 375°.
To prepare the muffins, lightly spoon 1 1/2 cups 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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