Indulge in these soft mini sponge cakes, infused with the zesty touch of orange and the sweet aroma of vanilla. A delightful treat perfect for any time of day.
Preheat the oven to 325°F (165°C). Grease 16 muffin cups.
In a large bowl, mix together the flour, sugar, baking powder, and salt until well combined. Create a well in the center and add oil, egg yolks, orange peel, vanilla, orange juice, and water. Mix well by hand until smooth with no lumps. Set aside.
In a separate large glass or metal mixing bowl, beat egg whites and cream of tartar until foamy. Gradually add 1/2 cup sugar, continuing to beat until soft peaks form. The peaks should not be stiff but rather soft and mound-like.
Gently fold the flour mixture into the egg whites until incorporated. Carefully pour the batter into the prepared muffin cups, filling each about 2/3 full.
Bake for about 40 minutes or until a toothpick inserted in the center comes out clean. Allow the cakes to cool in the pans for 10 minutes before removing them to a wire rack to cool completely.
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