Add the flour and cook on medium for three to four minutes. It will start of clump together and the butter will separate from the lumps a bit when it is cooked enough. Do not brow. Add the garlic, salt and pepper.
Add the milk and bring to a low boil. Add the cream and continue to boil gently. Stir in the spinach dip. Grate some fresh nutmeg (about an 1/8 teaspoon) and simmer for a few minutes.
Serve on your favorite pasta. Or add your favorite grated cheese (2 or 3 cups) and mix with elbow macaroni. Top with your favorite mac and cheese topping and bake at 350 for half an hour.