Broccoli Chicken Fettuccine

Ingredients

• 4 ounces uncooked fettuccine
• 1/2 pound boneless skinless chicken breasts, cut into 1-inch pieces
• 1 small onion, halved and sliced
• 2 tablespoons butter
• 4 garlic cloves, minced
• 1 can (10-3/4 ounces) condensed cream of chicken soup, undiluted
• 1 cup chicken broth
• 1-1/2 cups frozen broccoli florets, thawed
• 1 can (4 ounces) mushroom stems and pieces, drained
• 1 teaspoon onion powder
• 1/2 teaspoon pepper
• 1/4 cup shredded Parmesan cheese