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1
For cake, heat oven to 350 degrees.
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2
Grease bottom and side of 2 round pans, 9x1 1/2 inches, with shortening; lightly flour.
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3
Heat water, butter, shortening and cocoa in 1-quart saucepan over medium heat, stirring occasionally, until smooth; remove from heat.
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4
Cool to room temperature.
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5
Mix flour, sugar, baking soda and salt in large bowl.
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6
Beat in cocoa mixture with electric mixer on low speed, scraping bowl occasionally, until smooth.
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7
Beat in sour cream, eggs and vanilla until smooth.
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8
Pour into pans.
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9
Bake 25-30 minutes or until toothpick inserted in center comes out clean.
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10
Cool 10 minutes; remove from pans to wire rack.
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11
Cool completely.
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12
For cream cheese filling, beat butter and cream cheese in medium bowl on medium speed until fluffy.
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13
Beat in powdered sugar and vanilla on low speed until smooth.
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14
When cake is cooled completely, fill layers with cream cheese filling.
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15
For chocolate frosting, beat butter in medium bowl on medium speed until fluffy.
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16
Gradually beat in remaining ingredients on low speed until smooth.
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17
Frost side and top of cake with chocolate frosting.
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18
Press walnuts on side of cake, if using.
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19
Store cake covered in refrigerator.
