1. Thawing and drying hash browns prevents a watery casserole 2. substitute turkey sausage or diced ham for pork sausage 3. use half and half for richer texture or reduce milk to 1 1/4 cups for firmer slices 4. assemble up to 24 hours ahead and bake from cold adding 5 to 10 minutes 5. cool fully then refrigerate up to 4 days or freeze portions up to 2 months