Instructions
Preheat the oven: Preheat the oven to 350°F (180°C) and grease a baking sheet with butter and sprinkle with cornstarch.
Beat the eggs: Separate the whites from the yolks. Beat the whites until stiff and set aside.
Mix the ingredients: In another bowl, mix the egg yolks, condensed milk, and melted butter until combined.
Add the cornstarch: Add the cornstarch to the egg yolk and condensed milk mixture, mixing well.
Stir in the egg whites: Add the egg whites to the mixture, gently folding with a spatula, using bottom-up movements to maintain a light texture.
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