1
Cook spaghetti or linguine according to package instructions.
2
In a large skillet, heat olive oil over medium heat.
3
Add garlic and cook for 1-2 minutes until fragrant.
4
Add rosemary and cook for another minute.
5
Add butter and stir until melted.
6
Add lemon zest and juice, and stir to combine.
7
Add Parmesan and stir until melted and smooth.
8
Season with salt, black pepper, and chili flakes (if using).
9
Toss cooked pasta in the garlic butter sauce and top with parsley.