From the
Internet 1/2 cup unsalted butter, room temperature
1/2 cup light brown sugar
1/4 cup white granulated sugar
1 large egg
1 teaspoon pure vanilla extract
1 cup all purpose flour
1/4 cup cocoa powder
1/2 teaspoon baking powder
1/8 teaspoon salt
1 1/2 cups white chocolate chips or chunks (optional)
Bake at 350ºF for 5 minutes (don't over-bake)