In a large pot of boiling salted water, cook spaghetti, or pasta of choice, according to package instructions; drain well and reserve ½ cup of pasta water.
In a large skillet over medium high heat, melt the butter, add the garlic and stir until fragrant and lightly golden, about 1-2 minutes
Add shrimp, salt and pepper to taste and cook stirring occasionally, until shrimp is opaque pink, about 2-3 minutes.
Add cooked spaghetti to the skillet, along with reserved pasta water, olive oil, and parmesan cheese. Toss to combine lightly and garnish with parsley.