Preheat oven to 400°F. Line 6 muffin cups with paper liners or grease tin.
Place bran muffin mix into mixing bowl; cut in butter or vegetable oil. Add remaining ingredients. Mix just until blended. Spoon batter into prepared muffin cups. Batter will be thick.
Bake for 15-17 minutes until toothpick inserted in center of muffin comes out clean
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