Heat oven to 400° F.Squeeze the spinach between paper towels to remove excess moisture. In a medium bowl, combine the spinach, artichokes, cream cheese, sour cream, and Cheddar. Season with the salt and pepper. Scrape the mixture into a small oven-safe baking dish. Bake until lightly golden and heated through, about 15 minutes. Serve warm with the chips or bread and the lemon wedges, if desired.