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Preheat the oven to 180°C and line a square baking pan with parchment paper.
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Melt the butter in a bowl and stir in the sugar until smooth.
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Add the eggs and vanilla extract. Whisk well until the mixture becomes glossy.
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Sift in cocoa powder, flour, and salt. Mix gently until a thick batter forms.
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Fold in the chocolate chips.
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Pour the batter into the prepared pan and spread it evenly.
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Bake for 20 to 25 minutes until the top forms a light crust and the center is set.
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Let the brownies cool before slicing and serving.