Artichoke Spinach Dip

(luckymommyto2boys ~ Amy ~ Recipezaar.com)

¼ cup butter
1 (10-oz) pkg frozen chopped spinach, partially thawed
1 (14-oz) can artichoke hearts, drained and chopped
2 (8-oz) pkgs cream cheese, softened
2 (16-oz) containers sour cream
1 cup grated Parmesan cheese
Garlic salt to taste

Melt butter in a large saucepan over medium heat. Stir in the spinach and artichoke hearts. Cook until tender, about 5 minutes.
Mix cream cheese and sour cream into the spinach mixture. Stir in the Parmesan cheese and garlic salt. Cook, stirring occasionally, until thickened, 10 to 15 minutes. Serve warm.