Sift the flour with the baking powder and salt. Beat the egg whites until stiff peaks form.
Grease a cake pan with butter and dust with flour, removing the excess.
Cream the butter with the sugar, add the egg yolks one by one, and incorporate the flour with the milk in two parts.
Gently fold in the egg whites.
Take 3/4 cup and add the chocolate. Add the vanilla to the remaining mixture.
Pour half of the vanilla mixture and spoon in the chocolate mixture, then add the remaining vanilla and spoon in the rest of the chocolate, swirling with a knife to create waves or zigzags.
Bake in a preheated oven at 190ºC or 350ºF for 1 hour or until a toothpick comes out clean, let cool for 10 minutes and unmold.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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