Cinnamon Chocolate Cake

2 cups all-purpose flour
2 cups sugar
1-1/2 teaspoons ground cinnamon
1/4 teaspoon salt
1 cup water
1/2 cup vegetable oil
1/2 cup butter, cubed
1/4 cup baking cocoa
2 eggs
1/2 cup buttermilk
1 teaspoon vanilla extract
1 teaspoon baking soda

Frosting:
1/2 cup butter, cubed
1/3 cup heavy whipping cream
1/4 cup baking cocoa
1-1/2 teaspoons ground cinnamon
3 cups confectioners' sugar
1 teaspoon vanilla extract
1 cup finely chopped walnuts

In a bowl, combine the first four ingredients. In a saucepan, combine the water, oil, butter and cocoa; bring just to a boil over medium heat. Pour over dry ingredients; mix well. Add eggs, buttermilk, vanilla and baking soda; mix well. Pour into a greased 15-in. x 10-in. x 1-in. baking pan. Bake at 375° for 15-20 minutes or until a toothpick inserted near the center comes out clean. Place on a wire rack.

Meanwhile, for frosting, combine the butter, cream, cocoa and cinnamon in a saucepan. Cook and stir over medium heat until butter is melted and mixture is heated through. Remove from the heat; beat in sugar and vanilla until smooth. Stir in walnuts. Carefully spread over warm cake. Cool completely. Makes 24-30 servings.

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