One Pot Chicken Tetrazzini

Ingredients

• 4 tablespoons butter (unsalted, divided)
• 1 chicken breast (boneless and skinless, cut into cubes)
• 2 cups mushrooms (cleaned and sliced)
• ½ teaspoon salt (or to taste)
• 1 teaspoon pepper (or to taste)
• 1 teaspoon garlic powder (optional)
• ¼ cup all-purpose flour
• 3 cups chicken broth (low sodium)
• 1 cup milk (I used 2%)
• 8 ounces spaghetti (fettuccini or linguini, uncooked)
• ¼ cup Parmesan cheese
• 2 tablespoons parsley (fresh, chopped )