cheesy broccoli and rice casserole

Ingredients For cheesy broccoli and rice casserole

• 2 (6.4 oz) box

  creamy four cheese rice a roni
• 1 lg

  onion,chopped
• 2 clove

  garlic,minced
• 2 c

  fresh or frozen broccoli flowerettes,cooked until tender
• 1 (7 oz.) jar

  sliced mushrooms,drained
• 1 (8 oz.) can

  water chestnuts,chopped
• 2 can

  cream of celery or mushroom soup
• 1-2 c

  cheddar or monterey jack cheese,depending on how cheesy you want it
• 2 Tbsp

  chopped fresh parsley
• 1/2 tsp

  freshly ground black pepper
• salt to taste
• 1/2 c

  chicken stock or broth;more if needed