Step 1 of 10
Parsnip and Root Vegetable Casserole
Preheat the oven to 375°F.
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Step 2 of 10
Parsnip and Root Vegetable Casserole
Spray a 9x13-inch baking dish liberally with nonstick cooking spray. Set aside.
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Step 3 of 10
Parsnip and Root Vegetable Casserole
Slice the parsnips and root vegetables into 1/8-inch thick slices. Sprinkle the slices liberally with the salt and black pepper.
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Step 4 of 10
Parsnip and Root Vegetable Casserole
Set a medium saucepan over medium heat and add the butter. Once melted, sprinkle the flour into the pan and whisk to form a paste. Cook for 30 seconds to 1 minute, then slowly pour the half and half into the pan, whisking to dissolve the flour.
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Step 5 of 10
Parsnip and Root Vegetable Casserole
Cook the sauce, whisking constantly, until it begins to bubble and thicken. Once thickened, turn off the heat. Season with salt, black pepper, and nutmeg. Add the grated Parmesan and whisk slowly until the cheese is melted and the sauce is smooth.
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Step 6 of 10
Parsnip and Root Vegetable Casserole
Arrange half of the parsnip and root vegetable slices in an even layer in the baking dish. Sprinkle with the fresh thyme leaves, and pour half of the cheese sauce on top. Repeat with the remaining vegetable slices and sauce.
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Step 7 of 10
Parsnip and Root Vegetable Casserole
Place the panko and shredded cheese in a mixing bowl and add the melted butter. Mix the ingredients together with a fork until the crumbs are evenly moistened. Sprinkle the mixture evenly over the top of the casserole.
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Step 8 of 10
Parsnip and Root Vegetable Casserole
Bake the casserole on middle rack of oven until the vegetables are tender and the dish is bubbling and browned on top, 40-45 minutes. If the topping appears to be browning too quickly during the cooking time, cover the dish loosely with a sheet of aluminum foil.
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Step 9 of 10
Parsnip and Root Vegetable Casserole
Check to see that casserole is done. Remove from oven or add time as needed.
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Step 10 of 10
Parsnip and Root Vegetable Casserole
Allow the casserole to cool for 10 minutes before serving.