Line a baking sheet with parchment paper. Set aside.
In a medium saucepan, combine the coconut milk, cashew butter, maple syrup, and cocoa powder over medium-low heat. Cook for 3-5 minutes until the mixture thickens and becomes sauce-like. Bring it to a soft boil for 1 minute, stirring continuously to avoid burning.
Remove the pan from the heat and add the quick cooking oats. Stir to combine thoroughly.
Use a cookie scoop to form 12 cookie dough balls on the parchment paper-lined baking sheet. Flatten and round each cookie with the bottom of a measuring cup. Place the baking sheet in the freezer for 10 minutes.
Melt the chocolate chips and coconut milk together in the microwave for 30-60 seconds, stirring until smooth.
Use a spoon to top the frozen cookies with the chocolate ganache and then sprinkle with chocolate colored candies. Freeze again for 10 minutes to set.
Enjoy your delicious no-bake cosmic brownie cookies! Store them in the fridge or at room temperature in an airtight container.