Chocolate Chocolate-Chip Muffins

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1 3/4 cups all-purpose flour

2 teaspoons baking powder

1/2 teaspoon baking soda

2 tablespoons best quality cocoa powder

3/4 cup superfine sugar

3/4 cup semisweet chocolate chips, plus 1/4 cup for sprinkling

1 cup milk

1/3 cup plus 2 teaspoons vegetable oil

1 egg

1 teaspoon pure vanilla extract