Prepare the chickpeas by draining and rinsing them thoroughly under cold water. For an extra smooth hummus, take an additional minute to pinch the skins off each chickpea—this step is optional but results in silkier texture.
Add the chickpeas, pumpkin puree, tahini, lemon juice, olive oil, garlic, chopped sage, cumin, smoked paprika, and salt to your food processor. Process for 1-2 minutes until ingredients are well combined but still slightly chunky.
Scrape down the sides of the food processor with a rubber spatula to ensure all ingredients incorporate evenly.
With the machine running, slowly add cold water one tablespoon at a time through the feed tube until you reach your desired consistency. For a thicker dip, use less water; for a smoother, more spreadable hummus, add all 3 tablespoons.
Continue processing for another 1-2 minutes until the hummus becomes very smooth and creamy. The longer you process, the airier and lighter your hummus will become.
Taste and adjust seasoning as needed, adding more salt, lemon juice, or sage according to your preference.
Transfer to a serving bowl and create a shallow well in the center with the back of a spoon. Drizzle with additional olive oil, sprinkle with smoked paprika, and garnish with fresh sage leaves and pepitas if desired.