salt. in small bowl, combine milk, oil, vanilla, and egg. add liquid ingredients all at once to dry ingredients, stirring gently just until moistened. gently fold in rhubarb. spoon batter into prepared muffin cups, filling 2/3 full. bake at 400 degrees for 20 to 25 minutes or until lightly golden brown. immediately remove from pan. sprinkle warm muffins with powdered sugar. 