In a large pot, bring salted water to a boil. Add the bow tie pasta and cook according to package instructions until al dente. Drain the pasta, but reserve about ½ cup of the pasta water for later.

In a large skillet, heat 2 tablespoons of olive oil over medium heat. Add the thinly sliced onions and a pinch of salt. Cook, stirring occasionally, for about 15 minutes until the onions become golden brown and caramelized.

Once the onions are caramelized, add the sliced mushrooms. Cook for an additional 5-7 minutes until the mushrooms are tender and browned. Stir occasionally to ensure even cooking.

Sprinkle minced garlic into the skillet and sauté for about 1 minute until fragrant. Add the fresh spinach, stirring until wilted—this will take just a couple of minutes.

Toss in the cooked bow tie pasta to the skillet with the onion and mushroom mixture. If the dish looks dry, add a bit of the reserved pasta water until you reach your desired consistency. Season with salt and pepper to taste.

Plate the pasta and finish with freshly grated Parmesan cheese if desired. Enjoy your delicious homemade creation!