Preheat your oven to 375⁰F.

In a deep saucepan, melt butter together with olive oil, add your onion and garlic, and Sautee.

Using a whisk, Add your seasonings and mix. Then add your flour. Let the flour cook for a min or so. Slowly add 1.5 cup of milk at a time, letting the sauce thicken in between each batch until you've used up all of the milk.

Assemble your lasagna, starting with a thin later of sauce on the bottom of the casserole.
Noodles
Turkey
Sauce
Spinach
Shredded cheese
Repeat until everything is used up.

Add your final layer of shredded cheese to the top.
Bake at 375⁰F for 35 minutes covered with foil

Remove foil, place back in the oven uncovered for another 10-12.

Let sit for 10 min before serving. Serve with a side salad.