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Preheat oven to 325 degrees F. Grease and flour 2 eight inch or 1 ten inch cake pan.
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Sift together the flour, salt and baking powder
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Beat together the eggs, sugar and vanilla extract until foamy. Add the oil and milk and stir before folding in the sifted dry ingredients.
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Divide the batter in two equal portions and the additional 2 tbsp milk along with the cocoa to one portion, folding gently until well blended.
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Using 1/4 cup of the batter at a time, begin by pouring vanilla batter in the center of the pan, then immediately pour another 1/4 cup of the chocolate batter directly in the center of the vanilla batter. Continue alternating between the two flavors, always pouring the batter directly in the center of the pan until all the batter has been used. This will allow the stripes to naturally form.
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Bake for 30-40 minutes or until a toothpick inserted in the center comes out clean. Cool completely on a wire rack before frosting and serving.