Cook the rice to the package instructions using a rice cooker, instant pot, or stovetop method.
Meanwhile, in a blender or food processor, combine the rest of the ingredients until smooth, scraping down the sides a few times if needed.
Taste the cilantro mixture and add more salt if needed, it should be very flavorful to the point of being too salty - this is because we're adding it to plain white rice, so we need the seasoning.
To the hot cooked rice, gently stir in all of the cilantro mixture. Taste once more for seasoning. Serve with your favorite Mexican meal!
Notes
Make Ahead: The green paste is easy to make in advance; just keep it in the fridge in a storage container for 3-4 days until ready to use, then stir it into freshly cooked rice.
Leftovers: Leftovers are yummy in the fridge for several days, just microwave them covered in a damp paper towel to reheat.