eggs one at a time to creamed mixtureSift flour, baking powder, baking soda and salt together.Add lemon juice (or essential oils) to milkAdd milk mixture and flour mixture alternately to your sugar, butter and eggs mixture until smoothAdd blueberries or other fruits and mixPour into jumbo (or regular) muffins pansBake in heated oven 220?? C. for 20 or 25 minutes.