Oatmeal Spice Bars

½ pkg. spice cake mix
1 egg
½ C. cooking oil
1 C. quick cooking oatmeal
½ C. raisins
½ C. chopped nuts
½ C. plain yogurt

Combine all ingredients in a large bowl. Mix well until cake mix is moist. Grease an 8 inch square baking pan. Pour mixture into pan and bake at 375 degrees for about 20 minutes. Remove from oven when center is done and allow to cool. Cut into bars and serve. For an added treat, serve slightly warm with a dollop of strawberry yogurt or ice cream.