Creamy Mushroom and Chicken Orzo

Name: Creamy Mushroom and Chicken Orzo
Prep time: 5 min
Cook time: 35 min
Total time: 40 min
Cuisine: American
Ingredients: 15 oz Boneless, Skinless, Chicken Breast ((about 2 large breast)); ¼ tsp Black Pepper; ¼ tsp Garlic Powder; ½ tbsp Extra Virgin Olive Oil; 1½ cups White Mushrooms (sliced, (about 120 grams)); ? cups Yellow Onion (diced, (about50 grams, or ¼ an onion)); 2 cloves Fresh Garlic (diced, (about 7.5 grams)); 1¼ cups Water ((about 10 oz)); 1 cup Orzo ((about 108 grams)); Dash tsp Salt; 1½ cups Spinach (torn, (about 50 grams)); ¼ cup Dubliner Cheese (any white cheddar cheese, freshly shredded (about 20 grams))