Preheat the oven to 350 °F. Lightly spray an 8x8-inch baking dish with nonstick spray.
Boil a pot of water and prepare the pasta according to package instructions -- cook until al dente, not quite tender, 3 to 4 minutes less than what the package instructions say. Drain and set aside.
While the pasta is cooking, heat the oil in a skillet over medium heat. Cook the onion for about 3 minutes, until it just begins to soften.
Add the zucchini slices to the skillet and put the lid on for about 3 minutes to steam the zucchini a little until it starts to soften and turn light brown.
Add the garlic, nutmeg and pepper to the skillet. Stir for about 1 minute, until the garlic is fragrant.
Stir condensed cream of mushroom soup and milk into the zucchini mixture. Turn the heat up to medium-high and bring the mixture to a boil, then turn the heat down low and let it simmer for about 3 minutes, until the mixture starts to thicken.
Stir in the turkey, pasta, and Parmesan cheese (reserve 2 tablespoons of cheese for sprinkling on top)
Spoon the mixture into the prepared baking dish.
Stir together the panko bread crumbs and the reserved 2 tablespoons of Parmesan cheese. Sprinkle evenly over the top of the turkey/pasta mixture. Give it a light spray with nonstick spray or an olive oil mister.
Bake for 25 minutes at 350 °F until the top is browned.