Best Coffee Cake

1 cup granulated sugar
1 cup brown sugar, packed
1 cup butter or margarine
3 cups all-purpose flour
1/2 cup chopped nuts
1 1/2 teaspoons ground cinnamon
1 cup buttermilk
2 large eggs
1 teaspoon vanilla extract
1/2 teaspoon salt
1 teaspoon baking powder
1 teaspoon baking soda

1. Preheat oven to 350*F (175*C). Grease a 13 x 9 x 2-inch baking pan; set aside.
2. Combine the first 6 ingredients until crumbly. Reserve 1 cup of crumb mixture and set aside for topping.
3. To the remaining crumb mixture add the rest of the ingredients from the buttermilk to the baking soda and stir by hand to combine. Mixture will be slightly lumpy.
4. Pour into prepared baking pan. Top with the reserved 1 cup crumb mixture and bake for 25 or 30 minutes or until tested done when wooden pick inserted in center comes out clean. Serve warm.

Makes 16 servings.