So easy to mix together and put into your slow cooker.   Slow Cooker Hot Spinach Dip Ingredients 1/2 (10 ounce) package frozen spinach, thawed, drained and coarsely chopped 4 ounces cream cheese, room temperature 1/2 cup sour cream 1/4 cup mayonnaise 1 clove garlic, grated 1/4 cup grated parmesan cheese 1/4 cup shredded mozzarella