Microwave Bran Muffins

Place water in a suitable microwave bowl. Heat until boiling (about 1 minute). Add bran and butter and stir until butter is melted and bran softened. Beat in sugar and egg. Blend in remaining ingredients. Spoon into double paper patty cases or paper lined muffin cups. The batter for this recipe may be kept in a covered bowl in the refrigerator for about 4 weeks. To cook, allow 30 seconds on high per muffin (dough at room temperature) or 45 seconds per muffin (refrigerated dough). Tested in a 600-700 watt oven, for 500 watt oven allow 15 seconds extra for every minute of cooking.