In a large skillet over medium heat, drizzle olive oil and sauté onion and garlic, until translucent and fragrant, about 3 minutes. Add squash, nutmeg, salt/pepper and cover, stirring occasionally, for about 8 minutes. Add sage and cook an additional minute.

Add vegetable broth and bring to a boil. Reduce heat and allow squash to simmer, uncovered, for about 20 minutes until the squash is soft and the broth is reduced by half.

Meanwhile, bring a large pot of salted water to a boil and cook pasta according to package directions. Drain and set aside.

Once the squash mixture is ready and has cooled slightly, add mixture to your food processor or blender and purée until smooth. Feel free to add extra vegetable broth or water as-needed for a thinner sauce.

Toss the spaghetti, zucchini noodles and sauce all together in the skillet you were just using and cook over medium heat for about 2 minutes, until everything is combined. Season with additional salt/pepper and sage, serve and enjoy!