Preheat oven to 200 degrees F. Spray a lined baking sheet with cooking spray and set aside.
Toss the cleaned squash seeds with olive oil. Sprinkle with cinnamon, ginger powder, chili powder, and a pinch of salt. Use as much or as little of the spices as you like. Spread the seeds in one layer on the prepared baking sheet.
Roast the seeds in the oven for 10-15 minutes, occasionally shaking them to make sure they are evenly roasted. Keep an eye on them so they don't burn. Remove from oven and let cool. Store in an airtight container.