Unstuffed Pasta Florentine

INGREDIENTS

1 lb

whole-wheat pasta (rigatoni)

4 tbsp

butter

1/2

onion (large, diced)

4 cloves

garlic (minced)

2 tbsp

whole-wheat flour

2 cups

milk (or cream, or a combination)

nutmeg

5 oz

spinach (fresh (or a combination of spinach/Swiss chard/kale, sometimes labeled as "Power Mix"))

1 1/2 cups

ricotta cheese

1/2 lb

mozzarella cheese (diced or shredded)

1 cup

parmesan cheese (grated)