To prepare the cookie:

1. In a large bowl or the bowl of a stand mixer, cream together the butter and brown sugar until fluffy, about 2 minutes. Add the honey and stir to combine. Stir in the egg and vanilla extract. Scrape the sides of the bowl and add the flour, baking soda, salt, and 1 teaspoon of cinnamon. The dough will be dry. Stir on low to combine and then use a small cookie scoop to scoop out 1” rounds of dough. Combine the sugar and remaining cinnamon in a small bowl. Roll each round of dough in the cinnamon sugar mixture. Use your thumb or the rounded bottom of a ¼ teaspoon to make little impressions into each cookie. Place the dough rounds on a sheet pan lined with parchment paper and cover with plastic wrap. Refrigerate for 1 hour.
2. Once ready to bake, preheat the oven to 350 and place the cookie dough balls 2” apart on multiple parchment-lined pans. Bake one at a time in the oven until the cookie edges are set, about 9 minutes. When you remove the pan from the oven, immediately use the back of the measuring spoon to make the thumbprint more defined, if needed. Allow to cool while you prepare the filling.

To prepare the filling:

1. In a small saucepan over low heat or a microwaveable bowl, combine the chocolate, butter, and corn syrup and gently melt, stirring regularly, until the chocolate has melted. Carefully put the mixture into a piping bag fitted with a round tip or a Ziploc bag with the end snipped off and carefully pipe a bit of the chocolate mixture into the thumbprint of each cookie. Place in the fridge to cool while you prepare the meringue.

To make the meringue:

1. Put your metal stand mixer bowl or large, heat-safe mixing bowl over a small saucepan filled with 1” of water as a double boiler. Add the egg whites and sugar to the top bowl and turn the heat to medium. Stirring frequently, gently heat the egg whites until the sugar has barely dissolved. You can carefully rub the mixture between two fingers- once it’s no longer gritty, it’s ready! Remove the bowl from the heat and place on the stand mixer fitted with the whisk attachment (or use a hand mixer with beaters!). Add the cream of tartar and mix on medium-high speed until the mixture cools, thickens, and fluffs to stiff peaks. (See the link in the text for how-to’s on making meringue. Add the vanilla and put the mixture into a piping bag fitted with a small open star tip. Pipe dollops of meringue on each cooled cookie and carefully use a torch or a broiler to toast the marshmallow! Enjoy!