In a large saucepan, heat a drizzle of oil with a dab of butter over medium-high heat. Cook the onion for a few minutes, until soft. Add the garlic scapes and tear in the chives, sprinkle with salt and cook for a few more minutes, until everything is soft.
Add the spinach and peas and cook until the spinach wilts. Add the stock and bring to a simmer; cook for 20 minutes, or until all the veggies are nice and soft.
Season with salt and add a splash of cream. Puree with a hand-held immersion blender (or transfer in batches to a regular blender) until smooth. Serve warm.