Heat oven to 350˚F. Line 2 baking sheets with parchment paper and set aside
For the graham cracker coating, place ½ cup graham cracker crumbs and melted butter in a shallow dish. Stir until combined. Set aside.
With a whisk, wooden spoon or sturdy spatula, stir together soft butter and sugar in a medium-large bowl for 1 minute until creamy. Add egg and vanilla and stir until completely incorporated.
Add ½ cup graham cracker crumbs and stir well to combine.
Sprinkle flour, baking soda, baking powder and salt evenly over the top of the butter mixture and stir until all flour is incorporated.
Working with 1 ½ tablespoons of dough at a time, roll into 1 ½-inch balls. Toss dough balls in the prepared graham cracker crumb mixture to coat. Space them evenly on prepared sheets, 12 per sheet.
Bake, 1 sheet at a time, until just set and beginning to crack on sides, 10 to 12 minutes. Let cookies cool on sheets for 5 minutes.
4. Adjust oven rack 10 inches below broiler element and heat broiler to high. Place one marshmallow half, cut side down, in center of each cookie. Broil cookies, one sheet at a time, until marshmallows are deep golden brown, 30 to 45 seconds, rotating halfway through for even browning, if needed.
Immediately place one Hershey Kiss in the center of each marshmallow, pressing down lightly. Repeat with remaining cookies, marshmallows, and Kisses. Let cookies cool slightly before serving (if you can stand it).