Potato Vegetable Lasagna - cooking recipe

Ingredients

vegetable cooking spray
6 oz. chopped onions
3 Tbsp. flour
1/4 tsp. nutmeg
2 1/4 c. skim milk or regular milk
2 1/2 oz. Mozzarella cheese, shredded
2 1/2 oz. Cheddar cheese, shredded
2 lb. potatoes, sliced
1 lb. thawed frozen chopped spinach, squeezed dry
3/4 lb. frozen sliced carrots, thawed
10 oz. cut broccoli, thawed
4 3/4 c. meatless spaghetti sauce
2 1/2 oz. Parmesan cheese

Preparation

Optional:
Can use fresh veggies, partially cooked in microwave, instead of frozen ones.