Heat water or broth in a medium pot, to boiling.
Add orzo and cook, according to package instructions, for about 8 minutes - until al dente. Drain water from orzo and set aside (out of the pot.)
Return pot to burner, over medium heat, and add butter and garlic. Stir until butter is melted, then add the milk and Parmesan. Stir until cheese is melted, then season with salt and pepper.
Add orzo back to pot and stir to combine. Taste and adjust seasonings, if needed.
Remove from heat, stir in parsley, and serve!