In a stockpot or skillet melt butter over medium heat. Add orzo and cook until orzo just starts to toast, about 2-3 minutes .
1 tbsp. butter, 1 cup orzo
Add water, milk, mustard, salt and garlic powder. Stir and bring to a simmer. Cook for 7-8 minutes until orzo is just tender (there will be liquid left).
2 cups water, 1 cup milk, 1 tsp. yellow mustard, 1 tsp. salt , 1 tsp. garlic powder
Turn off the heat and add the cheddar cheese. Stir until cheese is melted and combined. Do the same with the parmesan cheese. Season with additional salt & black pepper, if desired.
2 cups sharp cheddar cheese, 1/4 cup parmesan cheese
Let orzo sit off the heat for 5 minutes before serving. This allows the orzo to absorb more of the liquid to create the perfect creamy sauce.