1 cup (240 ml) semi sweet chocolate chips or 6 ounces (170 grams) semi sweet chocolate, chopped
1 cup (226 grams) unsalted butter, room temperature
3/4 cup (150 grams) white granulated sugar
1 large egg
1 teaspoon pure vanilla extract
1 1/2 cups (195 grams) all purpose flour
3/4 cup (70 grams) unsweetened cocoa powder (preferably Dutch processed)
1/4 teaspoon baking soda
1/4 teaspoon baking powder
1/4 teaspoon salt