Line 2 large cookie sheets with parchment paper and set aside. In a medium-sized saucepan, add the sugar, whole milk, butter, and cocoa powder. Bring to a simmer over medium-low heat, stirring to combine. Simmer for 1 minute or until all of the sugar is dissolved. Do not let the mixture boil.
In a large mixing bowl, add the large flake oats and shredded coconut, stir to combine. Pour the warm chocolate mixture over top of the oats and coconut. Use a sturdy wooden spoon or spatula and fold the mixture together until the oats are completely coated with the chocolate.
Using a large cookie scoop or a spoon, drop mounds of the prepared cookie dough onto the parchment-lined baking sheets. Use the back of a spoon or spatula to gently shape the dough into rough circles. Place the cookie sheets in the refrigerator for a minimum of 1 hour, or until the cookies completely harden.
Once the haystack cookies are completely set, transfer them from the baking sheets to an airtight container or a ziplock bag and refrigerate until ready to serve.
Notes
Whole milk can be substituted for any kind of plant milk or coconut cream.
If you made any changes to the ingredients or want peace of mind, add 1 Tablespoon of coconut oil to the chocolate mixture. This will ensure the cookies set firmly.
Store haystack cookies in an airtight container at room temperature for up to 4 days, in the refrigerator for up to 1 week or freeze them for up to 3 months.
To make these cookies without coconut, replace the coconut with extra oats or different add-ins.