Topping (recipe follows) In large bowl, mix flour, sugar, baking powder, salt, and baking soda. Add starter, oil, egg, raisins and nuts; stir to mix well. Spread in greased and floured 8" or 9" square pan; sprinkle with topping.
Bake in preheated 350 deg. Oven, 30 to 35 mins., or until browned and pick inserted in center comes out clean. Cool slightly in pan on rack; cut into squares. Best served warm. Note: The original coffee cake recipe was doubled and baked in a 13 x 9 x 2 inch pan about 45 mins.
Topping: In a small bowl, mix 1/2 C. packed brown sugar, m 1-1/2 tsp. Each flour, cinnamon and granulated sugar. Cut in 2 Tbs. Butter (or margarine), at room temperature, until crumbly.
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