• Preheat your oven to 400 degrees.
• Use a 9 x 13 baking dish for this lasagna.

Making the Turkey Mixture and Preparing the Noodles:

• Brown the ground turkey with the minced onions and garlic.  Drain, and set aside.
• While the turkey is cooking, boil the lasagna noodles until they are al dente.

Making the Creamy White Cheese Sauce:

• In a heavy pot melt the butter over low-medium heat.
• Once the butter has melted, whisk in the flour until it is fully combined.
• Whisk in the whole milk, whisking constantly until the mixture thickens.
• Stir in the dry mustard.
• Add the shredded cheeses, and stir constantly until the cheese has melted. Set aside.

Putting it all together:

• Mix together the cooked ground turkey mixture and the creamy cheese sauce.

Now layer the ingredients as follows:

• In your 9 x 13 baking dish, add 1/2 of the turkey/cheese mixture
• Then lay out 3 noodles.
• Spread the Ricotta cheese over the noodles.
• Sprinkle on the chopped spinach.
• Lay out the remaining 3 lasagna noodles.
• Spread on the remainder of the turkey/cheese mixture
• Then sprinkle on the 1 cup of grated mixed white shredded cheese
• Bake for 45-50 minutes, or until the cheese is bubbling and lightly golden brown.
• Let rest for 5 minutes, then serve and enjoy!