Very tasty. It's rather soupy though, so it needs to stand and thicken up before serving.
2 tbsp extra virgin olive oil
2 medium zucchinis, sliced into thin rounds
2 tbsp margarine
2 tbsp flour
1 cup milk
1 tsp ground nutmeg
1/2 cup fresh grated Parmesan cheese
1 cup shredded sharp cheddar cheese
Salt and pepper to taste
Preheat broiler. Heat olive oil in a large skillet over medium-high heat. Add zucchini and onions, season with salt and pepper and saute for 5 to 1o minutes, stirring frequently, until zucchini rounds are crisp-tender.
Heat butter in a small saucepan over medium heat. When butter is completely melted, whisk in flour to form a roux. Cook until slightly brown. Whisk in milk, until sauce is thickened. Season with nutmeg and pepper. Stir in grated Parmesan cheese.
Transfer sauteed zucchini to a casserole dish. Pour sauce over the veggies and cover with shredded sharp cheddar. Broil for 3-4 minutes until cheese is bubbly.
--Adapted from Rachel Ray