5 Make sauce
Add spinach and garlic, and cook, stirring, for 2 min until the spinach becomes wilted. Sprinkle with the all purpose flour. Then gradually add milk, stirring constantly. Once boiling, reduce heat to medium. Add Parmesan (reserve some for garnish) and dried oregano. Cook for 2-3 minutes until the sauce thickens. Season with salt and pepper to taste.