"This is great way to get kids to gobble up their greens. You can assemble this casserole up to a day in advance. Keep it tightly covered and refrigerated until ready to bake and increase the cooking time by about 10 to 15 minutes...."
INGREDIENTS
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2 tablespoons butter, plus more for pan
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1 bag (16 ounces) chopped spinach, thawed and squeezed dry
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1 tablespoon olive oil
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1 bag (16 ounces) chopped mixed greens, or another single green such as kale or collard, thawed and squeezed dry
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1 small yellow onion, chopped
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1 1/2 cups grated cheddar cheese
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2 tablespoons flour
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1/2 cup grated gruyere cheese
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2 cups warm milk
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2 large eggs, lightly beaten
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1/2 teaspoon salt
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Pinch cayenne