Special Rhubarb Cake Recipe

Preheat oven to 350 degrees F (175 degrees C). Grease a 9-inch square cake pan.

Beat 2 tablespoons softened butter and 1 cup white sugar with an electric mixer in a large bowl until light and fluffy. Beat egg into the butter mixture.

Mix 2 cups flour baking powder baking soda and salt in a bowl; add flour mixture alternately with buttermilk to the butter mixture stirring just to combine into a batter. Fold rhubarb into the batter just until incorporated; pour into prepared pan.

Stir 2 tablespoons melted butter 1/4 cup flour and 1/4 cup white sugar together in a bowl until evenly moist; sprinkle over the batter.

Bake in the preheated oven until a toothpick inserted into the center comes out clean 35 to 40 minutes. Cool in the pan for 10 minutes before removing to cool completely on a wire rack.

Stir 1/2 cup butter brown sugar cream and vanilla together in a saucepan over medium heat; bring to a boil and cook for 1 minute. Serve sauce immediately with the warm cake.