Preheat your oven to 200°C (390°F). Peel the butternut squash with a vegetable peeler, then cut it in half lengthwise, scoop out the seeds, and dice into 2cm cubes.
Toss the diced squash with 1 tablespoon of olive oil, a pinch of salt, and cinnamon if desired. Spread evenly on a parchment-lined baking sheet.
Roast the squash in the oven for 30-35 minutes, until tender and caramelized with golden edges, filling your kitchen with a sweet, smoky aroma.
While the squash roasts, bring a large pot of salted water to a boil. Cook your pasta until al dente, about 8 minutes, then drain and set aside.
In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the minced garlic and sauté until fragrant and golden, about 1 minute.
Add the roasted squash to the skillet and gently mash with a fork to break it down slightly, creating a thick, fragrant mixture.
Pour in a splash of vegetable broth or water to loosen the mash slightly, then stir and simmer for 5 minutes, allowing flavors to meld.
Add the cooked pasta to the skillet, tossing to coat it evenly with the squash mixture.
Squeeze in the fresh lemon juice and stir well. Add the grated Parmesan and chopped sage, folding gently to combine everything beautifully.
Cook for another minute until the cheese melts slightly and the dish is heated through. Taste and adjust seasoning if needed.
Serve the pasta hot, garnished with extra Parmesan and sage if desired, and enjoy the comforting flavors of this caramelized butternut squash pasta.