Peppermint Patty Sandwich Cookies

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4 ounces bittersweet chocolate, chopped

3 sticks (1 1/2 cups) butter, at room temperature 

1 cup flour 

1/2 cup cocoa powder 

1/2 teaspoon baking powder 

1/2 cup light brown sugar 

1/2 cup granulated sugar 

1 teaspoon pure vanilla extract 

1/4 teaspoon salt 

2 eggs, at room temperature 

1/4 cup plain yogurt 

3 cups confectioners' sugar 

1/4 teaspoon peppermint extract 

10 chocolate-coated peppermint candies, such as York Peppermint Patties, chopped 

5 candy canes, crushed, optional