CHOCOLATE FROSTING
(makes 1 cup)

2 squares (1 ounce each) unsweetened chocolate, cut in small pieces
2 tablespoons butter
1/4 cup hot milk
1 teaspoon vanilla extract
2 cups confectioners` sugar

Put all ingredients into Osterizer blender container. Cover and process at BLEND until completely smooth. Chill to desired spreading consistency.

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VANILLA FROSTING
(makes 1 cup)

1/4 cup milk
2 tablespoons butter or margarine
2 teaspoons vanilla
2 1/2 cups confectioners` sugar

Put all ingredients except 1 cup (250 ml) confectioners` sugar into Osterizer blender container. Cover and process at BLEND until smooth. Stop machine. Remove cover; add remaining sugar. Process at BLEND until smooth. (If necessary, STOP BLENDER, use rubber spatula to keep mixture around processing blades. Cover and continue to process.)

From: Recipelink.com
Source: Manual: Osterizer Blender Creative Cookery Cookbook, 1979