No grainy soup: shred the cheese yourself and add it off the heat. Never boil the soup after the cheese goes in.Frozen broccoli: use 1 lb (450 g) straight from frozen and simmer about 8 minutes.Gluten-free: swap the flour for the same amount of sweet rice flour and use gluten-free broth.Storage: refrigerate up to 3 to 4 days. Freeze up to 2 to 3 months, ideally before adding the cheese. Reheat gently with a splash of milk to 165°F (74°C).Nutrition is an estimate per serving.