This to me is a great casserole to use up leftovers.After a dinner party one night, I had some leftover chicken and shrimp, but not enough to make a dish out of each, and wanted to use them up. So, I raided the fridge and pantry and basically grabbed ingredients I thought would work well together, and this was the result. Now this was almost 20 years ago. So, I am guessing, the shrimp was frozen, chicken was probably leftover from a baked whole chicken which works fine and the mushrooms, probably button mushrooms. It is nothing difficult, but it has such a great flavor and it is easy to put together. Now to even stretch the cost of the casserole even further, I love to serve this over toasted baguettes. Using leftover chicken is a great way to empty out your fridge, and the shrimp ... today you can get frozen shrimp (extra large or large) are honestly - they are not all that bad. In FL, I just got extra large previously frozen like most, but they steamed them at the seafood counter and they were only 3.99 lb. How can you go wrong. It gets even easier with pre-sliced mushrooms from the produce section and a can of artichoke hearts. So creamy, rich, filling and easy. It does take 30-45 minutes to bake, but putting together is pretty easy. Besides, served over toasted baguettes and a simple side of fresh fruit or tomato slices make for a easy dinner.