Old Fashioned Rhubarb Coffee Cake recipe features a homemade cake filled with delicious rhubarb and a crunchy cinnamon sugar topping. This will quickly become one of your favorite coffee cake recipes.
Preheat oven to 350 degrees F. Prepare a 9 x 13 inch baking dish by greasing and flouring.
With a mixer, cream brown sugar, softened butter and egg until smooth.
In a separate bowl, sift flour, baking soda and salt.
Alternately add buttermilk that has been mixed with vanilla and flour mixture to the creamed butter mixture. Do not over-mix. Once completely incorporated, stir in diced rhubarb.
Pour cake batter into prepared dish.
In a small bowl, mix 1/2 cup sugar, cinnamon and nuts. Sprinkle evenly over batter.
Bake for 45 to 50 minutes or until a toothpick comes out clean.