Slow Cooker Spinach and Cauliflower Mac and Cheese

Name: Slow Cooker Spinach and Cauliflower Mac and Cheese
Ingredients: 2 (12 fluid ounce) cans 2% evaporated milk; 2 cups unsalted chicken stock; 1 tablespoon low-sodium Worcestershire sauce; 2 tablespoons brown mustard; 1 teaspoon ground black pepper; 0.5 teaspoon garlic powder; 0.5 teaspoon paprika; 8 ounces processed cheese food (such as Velveeta®), cubed; 4 tablespoons butter, cubed; 8 ounces gluten-free elbow macaroni; 8 ounces shredded mozzarella cheese; 1 (12 ounce) package frozen chopped spinach; 1 (12 ounce) package frozen cauliflower