Position oven rack to the middle and pre-heat to 350 F.
In a medium mixing bowl, add yogurt, cream cheese, parmesan, mozzarella, chives, garlic, hot sauce (if using), salt, pepper, artichokes, and spinach. Stir to combine, making sure the cream cheese is evenly distributed.
Transfer mixture to your baking dish. Use a spatula or spoon to gently spread and flatten your dip.
Bake for 23-28 minutes or until heated through and bubbling. Serve warm.
Notes
Use about a cup of drained and chopped artichoke hearts.
Use about half cup of thawed and thoroughly squeezed spinach.