Combine the cheeses, butter, and sour cream in a pot over medium heat or on sautee in an Instant Pot pressure cooker until melted and combined.
While the cheese is melting drain and chop the artichokes and drain any excess liquid off of the spinach.
Stir the spinach, artichokes, chilies, and garlic into the cheese.
Serve warm. This makes enough to fill a 2 quart crock pot.