Cook the spaghetti noodles according to the package instructions until they are al dente. Drain and set aside.

In a large pan, melt the butter over medium heat. Add the minced garlic and red pepper flakes. Cook until the garlic becomes fragrant.

Turn the heat to low and add the cooked spaghetti to the pan. Toss the noodles in the garlic butter sauce to coat them evenly.

Season with salt and black pepper to taste. Then, drizzle over the lemon juice and toss the noodles again.

Just before serving, top the garlic butter noodles with freshly grated Parmesan cheese and garnish with chopped parsley.