Heat oven to 350 degrees F. Measure all ingredients into large mixer bowl. Mix half minute on low speed, scraping bowl constantly. Beat 3 minutes high speed, scraping bowl occasionally.
Pour into 9x13 inch pan or 2 9 inch layer pans. Bake oblong pan 40-45 minutes, layers 30-35 minutes or until top springs bake when touched lightly with finger. Cool. Frost.
For cupcakes pour batter into paper lined muffin cups, filling half full. Bake 20-25 minutes. Makes 3 dozen cupcakes.
For frosting: Mix margarine and cooled chocolate thoroughly. Blend in sugar. Stir in sour cream and vanilla. Beat until smooth and of spreading consistency.
By Robin from Washington, IA
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