01 - Bring a large pot of salted water to a rolling boil. Add pasta and cook according to package directions until al dente. Drain thoroughly and set aside, reserving a splash of pasta water if needed.
02 - Heat olive oil in a large skillet over medium heat. Add sliced mushrooms and diced onion. Sauté for 6–8 minutes, stirring occasionally, until mushrooms are golden brown and onions are translucent.
03 - Stir in minced garlic and sliced sun-dried tomatoes. Cook for 1–2 minutes, stirring constantly, until fragrant but not browned.
04 - Pour in heavy cream and vegetable broth. Add dried Italian herbs and red pepper flakes. Stir well to combine and bring the mixture to a gentle simmer, reducing heat if necessary to prevent boiling.
05 - Add chopped spinach to the simmering sauce. Cook for 1–2 minutes, stirring occasionally, just until leaves are wilted but still vibrant green.
06 - Reduce heat to low. Add the cooked pasta to the skillet. Using a wooden spoon or spatula, toss gently to coat every piece evenly with the creamy sauce.
07 - Sprinkle grated Parmesan cheese over the pasta. Stir continuously until cheese is completely melted and incorporated, creating a velvety coating. Season generously with salt and black pepper.
08 - Remove skillet from heat. Transfer to serving plates and sprinkle generously with fresh chopped basil and additional Parmesan cheese. Serve immediately while hot.