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Ingredients

• 10 tbsp unsalted butter, melted and warm
• 1.25 cup granulated sugar
• 80 g (3/4 cup + 2 tbsp) unsweetened cacao powder or coca powder
• 0.25 tsp kosher salt
• 2 large cold eggs
• 1 tsp vanilla extract
• 0.5 cup all-purpose flour
• 0.66 cup chopped walnuts or pecans (optional)