Place oatmeal, nuts, and seeds in a large bowl.
Add cinnamon powder, salt, and sugar, then mix well.
Pour in olive oil and maple syrup; toss until evenly coated.
Spread evenly onto a baking pan.
Bake in a 170°C (338°F) oven for 15–20 minutes.
Stir once halfway through, bake until golden and crisp.
Cool down and store in a container.