Rhubarb-Buttermilk Coffee Cake

Directions

1. Preheat oven to 350°. In a small bowl, combine rhubarb and 1/4 cup sugar. In a large bowl, cream butter and remaining sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Stir in vanilla. In another bowl, whisk flour, baking powder, salt and baking soda; add to creamed mixture alternately with buttermilk, beating well after each addition. Fold in rhubarb mixture.
2. Pour into a greased 9-in. square baking pan. In a small bowl, mix brown sugar and cinnamon; sprinkle over batter. Bake 25-30 minutes or until a toothpick inserted in the center comes out clean. Serve warm or at room temperature.