1. Bring a large pot of salted water to a boil. Add the spaghetti and cook until al dente, usually about 8-10 minutes depending on the brand. Be sure to reserve about 1 cup of pasta water before draining—it’s gold for adjusting the sauce consistency.
2. While the pasta cooks, heat the olive oil in a large skillet over medium heat. Add the sliced garlic and red pepper flakes, stirring frequently to prevent burning. Cook until the garlic is golden and fragrant, about 2-3 minutes. This step reminds me of standing on that stool in my grandmother’s kitchen, eagerly watching the garlic sizzle as the whole kitchen started to smell like something special was happening.
3. Add the sliced mushrooms to the skillet. Sauté for 6-8 minutes, stirring occasionally, until the mushrooms release their moisture and begin to brown. The caramelization here is key—it’s where the deep, earthy flavor develops.
4. Season the mushrooms with salt and pepper to taste. If you like, add a squeeze of lemon juice to brighten the flavors, just as my grandmother taught me to do with her simple vegetable dishes.
5. Toss the drained spaghetti into the skillet with the mushroom and garlic mixture. Add a splash of the reserved pasta water and stir to combine, letting the sauce lightly coat every strand. Add more pasta water if needed to create a silky texture.
6. Remove from heat and stir in the chopped parsley and grated Parmesan cheese. Give it one last toss, and taste to adjust seasoning if necessary.
7. Serve warm, with extra Parmesan on the side for those who like a little extra cheese.

I’ve found that stirring in pasta water little by little keeps the sauce from getting too oily or dry—it’s a trick I picked up from my mom, who always stressed the importance of texture in every bite.