Gently whisk in milk, 1 cup at a time, being sure to work out any lumps. Add flour and stir with a wooden spoon until a roux is formed. Add garlic and shallot to butter and cook for 1 minute.
Gently whisk in milk, 1 cup at a time, being sure to work out any lumps. Add flour and stir with a wooden spoon until a roux is formed. Add garlic and shallot to butter and cook for 1 minute.