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Preheat the oven to 350 degrees F.
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In a bowl, place all the ingredients, and mix well until no lumps are left in the batter.
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Grease a cake pan, and pour the vanilla batter into it.
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Bake in the oven for 30-40 minutes, or until done.
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While baking, make the frosting: in a bowl add the butter, powdered sugar, and cocoa powder. Mix for three minutes or until light and airy.
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Take the cake out of the oven, and wait 10 minutes before removing it from the cake pan.
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Let it cool for 15 minutes.
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Decorate it with the frosting.
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Top it with the orange slices.
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Serve and enjoy.