For Homemade Filling (Optional): Preheat oven to 400°F (200°C). Cut butternut squash in half, remove seeds, drizzle with olive oil, and roast cut-side down for 25–30 minutes until tender. Scoop out roasted squash and mash until smooth. Mix mashed squash with ricotta, nutmeg, salt, and pepper.
Cooking the Ravioli: Bring a large pot of salted water to a boil. Add ravioli and cook according to package instructions or until they float (3–5 minutes for fresh ravioli). Drain gently and set aside.
Preparing Sage Brown Butter Sauce:
In a large skillet, melt butter over medium heat.
Add sage leaves and cook 2–3 minutes until butter turns golden brown and develops a nutty aroma. Remove from heat and season with salt and pepper.
Combining: Gently toss cooked ravioli in the sage brown butter, coating each piece evenly. Transfer to plates, drizzle with any remaining butter, and garnish with Parmesan or pine nuts if desired.