Yummy aroma intense muffins perfect for anytime of the day, but especially delightful in the morning with a strong cup of coffee!
In a large bowl, combine the first five ingredients. Combine egg, buttermilk, oil and vanilla; stir into dry ingredients just until moistened. Fold in rhubarb. Fill greased or paper-lined muffins cups about half full. Combine topping ingredients; sprinkle over each muffin. Bake at 375 degrees F for 16-18 minutes or until muffins test done.