Preheat your oven to 400°F.
Peel, deseed, and cube the butternut squash, then toss with a teaspoon of olive oil and a pinch of salt.
Spread the squash on a baking sheet and roast in the oven for 25-30 minutes until tender and slightly caramelized.
While the squash roasts, finely chop the yellow onion and mince the garlic.
In a large pot, heat a splash of olive oil over medium heat and sauté the onion until softened, about 5 minutes. Add the garlic and cook for an additional minute.
Add the roasted squash, vegetable stock, and cannellini beans to the pot. Let simmer for 10 minutes, allowing the flavors to meld.
Blend the soup using an immersion blender until smooth and velvety. Adjust seasoning with salt and pepper if needed.
In a small pan, quickly crisp the sage leaves over medium heat until they are just crispy, being careful not to burn them.
Serve the soup in bowls, swirling in the nonfat Greek yogurt and garnishing with the crispy sage leaves.
Enjoy your warm and nourishing Velvety Roasted Butternut Squash Soup with Crispy Sage.