Preheat the oven to 325°F. Rinse 2 cups raw pumpkin seeds with about 4 cups cold filtered water until the clinging pumpkin pulp releases. Then spread the seeds in one layer and press them firmly between clean towels. Leave them uncovered for 10 minutes at room temperature, about 70°F. Turn the seeds once after 5 minutes so moisture trapped underneath can escape. Don't rush this stage because wet seeds steam instead of developing crisp shells. The seeds should look matte instead of glossy and they shouldn't leave damp spots when pressed. You'll also hear a faint dry rustle when you move them instead of a wet sticking sound. Cinnamon Sugar Roasted Pumpkin Seeds brown much more evenly when surface moisture is gone. Leave visible water behind and the sugar coating can slide off during roasting. Dry surfaces let the butter cling evenly and encourage crisp roasting.

Melt 2 tablespoons unsalted butter and let it cool to about 95°F for 2 minutes. Add 3 tablespoons granulated cane sugar, 1 1/2 teaspoons ground Ceylon cinnamon, 1/4 teaspoon fine sea salt and 1/2 teaspoon pure vanilla extract. Add the dry seeds and fold for 45 to 60 seconds. Scrape from the bottom and turn the seeds repeatedly until every shell carries a thin glossy coating. The mixture should smell strongly of warm cinnamon and vanilla while the sugar crystals remain visible. The seeds will shift from matte cream to glossy tan with darker cinnamon speckles. If the butter is much hotter than 110°F, the sugar starts dissolving too early and forms sticky patches. Cinnamon Sugar Roasted Pumpkin Seeds need an even coating before they hit the oven. Warm butter distributes fat without prematurely melting the sugar crystals.

Spread the coated seeds into one loose layer and roast at 325°F for 24 to 28 minutes. At minute 12, turn and redistribute them so seeds from the edges move toward the center. Keep the layer uneven rather than packed tightly. Continue roasting until most shells deepen from tan to amber. (I tried 350°F first, the sugar darkened before the centers crisped. 325°F gave me a much better batch.) By minute 24, you'll smell toasted cinnamon and caramel instead of raw butter. Some seeds should show deep mahogany patches while others stay golden amber just like the reference photos. You'll hear a faint dry crackle when the hot seeds shift. Go beyond 30 minutes and the exposed sugar can taste bitter. Cinnamon Sugar Roasted Pumpkin Seeds need moderate heat so the shells crisp before the sugar burns.

Remove the roasted seeds from the 325°F oven and leave them undisturbed for 5 minutes. Then separate any large clusters while they're still warm and let everything cool for another 15 minutes at about 70°F. Once cool, transfer a serving portion to a shallow bowl. Don't seal warm seeds in a container because trapped steam softens the shells and makes the cinnamon coating tacky. The finished seeds should feel dry and crisp rather than greasy. Their color will range naturally from golden amber to deep reddish mahogany and a few darker edges are expected. Bite one after the full 20-minute cooling period. You should hear a clean crunch and notice the buttery cinnamon aroma immediately. Skip the cooling window and the sugar crust stays softer. Cooling lets the caramelized sugar harden into a thin brittle coating.