Preheat oven to 350 °F (177 °C) and line a large rimmed baking sheet with a silicone baking mat or parchment paper.
In a large bowl, whisk together the oats, pumpkin seed, coconut flakes, and chia seeds.
3 cups rolled oats, 2/3 cup pumpkin seeds, 3/4 cup unsweetened flaked coconut, 3 tablespoons chia seeds
In a medium bowl, whisk together the pumpkin, coconut oil, maple syrup, salt, and pumpkin spice.
1/2 cup room temperature pumpkin puree, 1/2 cup melted coconut oil, 1/2 cup room temperature maple syrup, 1-1 1/2 teaspoons Diamond kosher salt, 1 heaping teaspoon pumpkin pie spice
Pour the liquid into the large bowl with the oats and mix and toss together with a spatula.
Spread into an even layer on the prepared baking sheet and bake for 15 minutes. Then remove from oven and stir around then bake for another 15 minutes.
Remove from oven and it will start to harden and crisp up as it cools.
Store in a plastic bag or glass container for up to seven days.