Step 1: Cook Pasta : Bring a large pot of salted water to a boil. Cook pasta according to package instructions until al dente. Drain and set aside, reserving 1/2 cup pasta water.

Step 2: Sauté Mushrooms : In a large skillet, heat butter and olive oil over medium heat. Add sliced mushrooms and cook 5-6 minutes until browned and tender.

Step 3: Add Garlic and Thyme : Add minced garlic and thyme to the skillet. Sauté for 1-2 minutes until fragrant, being careful not to burn the garlic.

Step 4: Combine with Pasta : Add cooked pasta to the skillet and toss to coat in the garlic-herb butter. Add reserved pasta water a little at a time to help the sauce coat the noodles evenly. Season with salt, black pepper, and optional red pepper flakes.

Step 5: Finish and Serve : Sprinkle with grated Parmesan cheese and chopped parsley. Serve hot.