Cinnamon Streusel Coffee Cake

Preheat oven to 350°F. Lightly grease a 9- or 10-inch cast-iron skillet. In a large bowl stir together flour, sugar, baking powder, and baking soda. Using a pastry blender, cut in butter until mixture resembles coarse crumbs. Make a well in center of flour mixture.

In a small bowl combine egg, buttermilk, and vanilla. Add egg mixture all at once to flour mixture. Stir just until moistened (batter should be slightly lumpy). Spread half of the batter into prepared skillet. Sprinkle with 3/4 cup of the Streusel. Drop remaining batter in small mounds onto layers in skillet; sprinkle with remaining streusel.

Bake 30 to 40 minutes or until golden and a toothpick comes out clean. Cool in skillet on a wire rack 30 minutes. If desired, drizzle with Powdered Sugar Icing and sprinkle with raspberries. Serve warm.