1 cup all-purpose flour

1/2 cup unsweetened cocoa powder

1/4 teaspoon baking powder

1/4 teaspoon salt

1/2 cup unsalted butter, melted

1 cup granulated sugar

2 large eggs

1 teaspoon vanilla extract

1/2 cup semisweet chocolate chips

1/2 cup cream cheese, softened

1/4 cup powdered sugar

1 teaspoon lemon zest (optional)

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