Preheat oven to 350 degrees. Grease a 13 x 9 x 2" baking pan.
2.
In a small bowl, mix 2 cups flour, baking powder, baking soda and salt; set aside.
3.
In a large mixer bowl at high speed, beat sugar and 1/2 cup softened butter or margarine until light and fluffy. At medium speed, beat in sour cream and eggs. Add flour mixture and beat at low speed until thoroughly blended. Stir in prunes. Spread in baking pan.
4.
In a small bowl, mix brown sugar, 1 tablespoon flour and cinnamon, With a pastry blender or two knives, cut in 3 tablespoons butter or margarine until pieces are the size of small peas. Stir in pecans. Sprinkle over batter in pan.
5.
Bake for 40 minutes or until a wooden pick inserted in center comes out clean. Place on a wire rack. Serve warm or at room temperature.
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