01 - Bring a large pot of salted water to a boil. Cook fettuccine according to package instructions until al dente. Reserve 1/2 cup pasta cooking water. Drain well and set aside.
02 - While pasta cooks, heat olive oil in a large skillet over medium heat. Add minced garlic and sauté for 30 seconds until fragrant.
03 - Add fresh spinach to the skillet and cook, stirring, for 1 to 2 minutes until wilted.
04 - Remove skillet from heat. Add Greek yogurt and grated parmesan cheese, stirring until a smooth, creamy sauce forms. Season with salt and black pepper to taste.
05 - Add drained fettuccine to the skillet. Toss thoroughly to coat, incorporating reserved pasta water gradually to achieve desired sauce consistency.
06 - Serve immediately, garnished with additional parmesan cheese and a pinch of red pepper flakes if desired.