Cream of Mushroom Chicken Recipe

Ingredients

• 2 tablespoons butter
• 1 (12 fluid ounce) can evaporated milk
• 1 (10.5 ounce) can condensed cream of mushroom soup
• 1.25 cups water, or as needed
• 1 onion, chopped
• salt and pepper to taste
• 2 pounds skinless, boneless chicken breast halves, cubed
• 1 (6 ounce) can sliced mushrooms, drained