Add shallots, carrots and sauté over medium heat until tender.
Add garlic and cook 2 minutes stirring around.
Add chicken broth and potatoes, bring to a boil, and cook until potatoes are tender. *Note: If using fresh bagged potatoes do not add them yet. Only add the stock. Bring that to a boil.
In a separate, lidded jar mix the milk and flour to make a slurry.
Pour all in at once and simmer until slightly thickened ~5-10 minutes.
Add in the broccoli and cauliflower spears, (bagged potatoes if using), cream, salt, pepper and nutmeg.
Mix well but gently.
Increase heat to medium and cook for 5-10 minutes or until the broccoli and cauliflower spears are cooked through and soft.