Line a large baking sheet with parchment paper and set aside.
Break the graham crackers into bite size pieces. You should have about 1 1/2 cups of graham pieces. Set aside.
Add the chocolate chips and coconut oil to a large microwave safe bowl. Place in the microwave and heat in 30 second intervals, stirring in between each interval, until smooth.
Add the graham cracker pieces and mini marshmallows to the melted chocolate. Gently stir with a spatula until well coated.
Spoon the mixture onto the prepared baking sheet, forming clusters, about 2 tablespoons per cluster. Make sure the clusters aren’t touching. Sprinkle with flaky sea salt.
Refrigerate for 1 hour or until the chocolate is set and the clusters are firm. You can also freeze them for 20 to 30 minutes to speed up the process. Transfer to an airtight container and store in the fridge for up to 2 weeks or freeze for up to 3 months.
Notes
Make sure you store the s'mores clusters in the refrigerator or freezer.