Heat oven to 400 degrees
Coat chicken with olive oil salt and pepper to taste
Roast chicken breast 15 minutes cool and shred
Melt butter in medium stock pot
Stir in flour whisking continuously
Slowly whisk in milk, chicken stock, salt, pepper and nutmeg
Simmer on low heat 10 minutes stir to prevent browning
Line 9 x 12 inch casserole dish with bechamel sauce
Dip the lasagna noodles in hot sauce
Start layering the lasagna noodles beginning with the bechamel sauce
Top with 1/3 the amount of chicken, spinach, cheeses and bechamel sauce
Repeat for three layers ending with lasagna noodles, bechamel and cheeses
Bake in a 400 degree oven 45 minutes to 1 hour or until golden and bubbly
Let rest 15 minutes before cutting