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Grease and lightly flour two 9x1 1/2-inch round baking pans or grease one 13x9x2-inch baking pan; set pan (s) aside.
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Stir together flour, baking powder, baking soda, and salt; set aside In a large mixing bowl beat the butter with an electric mixer on medium to high speed for 30 seconds.
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Add sugar; beat until well combined.
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Add eggs, 1 at a time, beating well after each.
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Beat chocolate and vanilla.
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Add flour mixture, beatiang on low speed after each addition just until combined.
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Pour batter into the prepared pan (s).
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Bake in a 350 degree over for 30 to 35 minutes or until wooden toothpick comes out clean.
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Cool layer cakes in pans on wire racks for 10 minutes.
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Remove from pans.
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Cool thoroughly on wire racks.
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Or, place 13x9-inch cake in pan on a wire rack; cool thoroughly.
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Frost with desired frosting.