INGREDIENTS
50
Starlight mints
1
Egg, large
1 cup
All-purpose flour, unbleached
1/4 tsp
Baking soda
2 oz
Bittersweet chocolate
1/3 cup
Brown sugar, packed dark
1/2 cup
Cocoa powder, Dutch-process
2/3 cup
Granulated sugar
1/4 tsp
Kosher salt
1/4 tsp
Peppermint extract, pure
3 oz
White chocolate
1
Vegetable-oil cooking spray
1 stick
Plus 2 tablespoons unsalted butter, room temperature