- In a large bowl, add sour cream and cream cheese, then mix until smooth and creamy. Add spinach, Parmesan cheese, dried minced onion, garlic, salt, pepper, and red pepper flakes, then use a spatula to fold and mix everything together Transfer the dip to a wide, shallow baking dish. Bake spinach dip for 10 minutes. Serve spinach dip immediately with sliced french bread.