Step 1

Preheat oven to 400 degrees F. Spray 8 x 11" or 9 x 13" pan with cooking spray, and set aside.

Step 2

Meanwhile, in a large mixing bowl, add squash, spinach, and potatoes.

Step 3

Melt butter in a skillet over medium-high heat. Add onion, and stir fry 3-5 minutes until translucent. Stir in garlic, then add turkey, salt, poultry seasoning, and pepper. Stir and cook, breaking up the meat into small pieces as it browns.

Step 4

Sprinkle flour over the meat, and stir to coat. Stir in milk, and bring mixture to a simmer, stirring often. Sauce will thicken after a couple minutes of simmering.

Step 5

Turn off heat, and stir in 1/4 cup parmesan cheese. Pour meat mixture into bowl with squash and potatoes. Stir well to combine.

Step 6

Spread mixture into prepared baking dish. Cover with foil, and bake for 30 minutes. Remove foil, and bake 20 minutes longer, or until a knife can be easily inserted into squash pieces.

Step 7

Sprinkle remaining 1/4 cup parmesan cheese over the casserole, and bake for 3-5 minutes longer. Serve warm.