Boil water and cook spaghetti according to package instructions.
While the spaghetti is cooking, in a blender, combine poblanos, milk, cream cheese, garlic cloves, salt, chicken bouillon, cilantro, serrano, avocado, and sour cream. Blend until smooth.
Drain the cooked spaghetti and return it to the pot.
Pour the green sauce over the spaghetti and stir to coat.
Heat the spaghetti over low heat for a few minutes until the sauce is heated through.
Serve hot and enjoy!