Preheat oven to 325° F.
Use a hand mixer to beat melted butter, chocolate sunflower seed butter, and sugar on high until creamy.
Add egg, and beat until batter is well combined and creamy.
Add all dry ingredients, and fold into batter with a spatula.
Mix in dark chocolate chips.
Line a baking sheet with parchment paper, and roll cookie dough into balls using your hands.
Bake for 16 minutes.
Melt peppermint white chocolate chips in the microwave until melted and smooth. Place candy canes in a ziploc bag, and use the back of a mug to crush into small pieces.
Remove cookies from oven. Let cool on baking sheet for 5 minutes before dipping half of each cookie into melted white chocolate.
Sprinkle with crushed candy canes, and let chocolate set in the fridge for 10 minutes before serving.