Rinse quinoa under cold water. In a saucepan, add rinsed quinoa and 2 cups water. Bring to boil, reduce heat to low, cover and simmer for about 15 minutes until fluffy and water absorbed. Let cool slightly.
Preheat oven to 350°F (175°C). Spread chopped almonds, cashews, and mixed seeds on a baking sheet in a single layer. Roast for about 10 minutes, stirring halfway until golden and fragrant.
In a medium saucepan over low heat, combine chopped dark chocolate and coconut oil. Stir continuously until melted and smooth. Remove from heat, stir in honey or maple syrup, vanilla, coffee granules (if using), and a pinch of flaky sea salt.
In a large mixing bowl, combine cooked quinoa, roasted nuts, and seeds. Pour melted chocolate mixture over quinoa and stir until evenly coated.
Transfer mixture to prepared baking sheet. Use spatula to spread evenly into a thin layer. Sprinkle cacao nibs and dried roses on top if desired. Place in fridge for about 2 hours until set.
Once set, remove from fridge. Break into pieces and store in an airtight container. Enjoy as a snack, dessert, or breakfast on the go!