Bring 4 cups of water or chicken broth with 1 teaspoon salt to a boil in a large pot.
Add the orzo to the boiling liquid and cook according to package directions, about 8-10 minutes, stirring occasionally.
Drain the orzo, reserving half a cup of the cooking water, then set aside.
Heat olive oil in a skillet over medium heat and sauté minced garlic for 1-2 minutes until fragrant but not browned.
Add the butter to the skillet, stirring until melted and combined with the garlic and oil.
Toss the cooked orzo into the skillet with the garlic butter, mixing well to coat evenly.
If the pasta looks dry, gradually stir in some reserved pasta water until creamy.
Fold in the grated Parmesan cheese, allowing it to melt and form a smooth sauce.
Season the pasta with salt and pepper to your preference.
Remove from heat and garnish with chopped fresh parsley, if desired.
Serve the Garlic Parmesan Orzo Pasta warm as a flavorful side dish.