Add cream cheese cubes, salsa verde, and shredded Monterey Jack cheese to the slow cooker.
Set the slow cooker to low heat and cover with a lid.
Cook for 1.5 to 2 hours, stirring occasionally to ensure even melting.
Once fully melted, stir well to combine all ingredients into a smooth, creamy consistency.
Taste and adjust seasoning if needed (add salt, more salsa, or extra spice).
Switch the slow cooker to the warm setting to keep the queso hot for serving.
Serve immediately with tortilla chips, veggies, or your favorite dippers.
Enjoy the easiest, creamiest queso ever!