Baked Butternut Squash Pasta

Name: Baked Butternut Squash Pasta
Cuisine: European, Italian, Mediterranean
Ingredients: ½ cup hazelnuts or walnuts; olive oil; 1 large onion, (finely chopped); 3 garlic cloves, (thinly sliced); ½ tsp crushed red pepper flakes ((more or less, depending on your tolerance for heat)); 1 medium butternut squash weighing about 2 ½ pounds,; 1 cup low-sodium chicken stock ((or broth) + more as needed, to thin the sauce); 1 cup greek yogurt; ½ cups Parmesan, (finely grated (about 2 oz), divided + more for serving); 1 pound paccheri or rigatoni ((use gluten-free noodles to make the entire recipe gluten-free)); 1 cup basil leaves, (torn); fine grain sea salt + freshly ground black pepper