1 cup (2 sticks) unsalted butter, melted and cooled
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1 teaspoon vanilla extract
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3 large eggs
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1 cup all-purpose flour
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1/2 cup unsweetened cocoa powder
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1 teaspoon fine salt
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1/2 teaspoon baking powder
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One 12-ounce bag semisweet chocolate chips
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Suggested topping combinations: white chocolate chips and toasted chopped walnuts; cashews and dried cranberries; chopped pretzels and raisins; toasted coconut and chopped dried pineapple; or any combination of chopped dried fruit, toasted nuts, mini