Chicken/Tofu and Shroom Casserole - super fast:

Diced/strips of chicken or tofu
Veggies of choice (Optional, but I put veg in bloody everything)
Onion
Garlic
Cream
Flour, Arrowroot or thickener of choice
Mustard
Seasoning to taste

Really quick one-pot dish.

Serve with bread and butter to sop up the sauce.