INGREDIENTS
8 oz
penne pasta
2 tbsp
butter
1/2
yellow onion, chopped
1 tsp
garlic, minced
8 oz
fresh spinach, washed, drained, and chopped
2 tbsp
all purpose flour
3/4 cup
milk
1/2 cup
shredded mozzarella cheese
1/2 cup
ricotta cheese
1 tsp
sugar
coarse salt and freshly ground pepper,
1/2 tsp
crushed red pepper flakes
1/2 cup
shredded Parmesan cheese