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Preheat the oven to 180°C (350°F) and line a baking tray with parchment paper.
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In a bowl, whisk the melted butter, brown sugar, and white sugar until smooth.
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Add the egg and vanilla extract, then mix until fully combined.
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Stir in the flour, baking soda, and fine salt until a soft dough forms.
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Scoop small portions of dough onto the tray, leaving space between each cookie.
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Sprinkle a few sea salt flakes on top of each one.
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Bake for 9 to 10 minutes, until the edges are set and the centers look slightly soft.
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Let cool for a few minutes before serving.