Preheat oven to 375℉ and line a baking sheet with parchment paper.
In a large bowl, whisk together melted butter, brown sugar, egg and vanilla, until smooth.
Add flour, espresso, cinnamon, nutmeg, baking soda and salt. Fold with a spatula until just combined.
Add chopped chocolate and candies. Mix until just combined. There should be no visible flour streaks.
Scoop into 1/4 cup cookie dough balls.
Place each cookie 3 inches apart on the baking sheet. Bake for 10 minutes, or until the center looks dry and the edges are lightly golden.
If desired, press in any additional candies while the cookies are warm, around 5 minutes after pulling them out of the oven.