Dark Chocolate Candy Cane Cookies

all-purpose flour

Dutch-processed cocoa powder (sifted)

black cocoa powder (sifted)

baking soda

sea salt

unsalted butter (room temperature)

granulated sugar

light-brown sugar (packed)

large eggs (room temperature)

peppermint extract (optional)

bag Bright White Candy Melts (or white chocolate, melted*)

crushed candy canes