Add freshness: Including at least one fresh vegetable, such as mushrooms, will add a fresh taste to the recipe.
Keep an eye on it: Take care not to overcook the casserole when the topping is in place because it might burn.
Fresh vegetables: When using fresh vegetables, bear in mind dense ones (pumpkin or carrots for example) take longer to cook than soft ones (like mushrooms or zucchini), so you'll need to bake the dense ones for a while before adding the softer ones, so everything is done at the same time.
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