Mix all ingredients together, folding in the rhubarb last. Spread in 9 x 13-inch baking pan. Sprinkle with sugar and cinnamon (to your own preferred measurements.) Bake at 350 degrees for 35 to 45 minutes.

NOTE: Mix soda in buttermilk. I do my own ‘buttermilk’ by adding one tablespoon of vinegar to one cup of Lactaid milk and let stand for five minutes (for lactose-free). (Can also add to regular milk.)