Rinse the kale, then remove the tough stems with a knife or with your fingers. Chop or tear the leaves into medium pieces and transfer to a large bowl.

To the bowl of kale, add the nutritional yeast, salt, black pepper, fresh garlic (or garlic powder), and red pepper flakes (if using). Use your hands to massage it, squeezing the leaves and tearing any large pieces. Massage for a minute or two, until it looks glossy and has decreased in volume a bit.

Cut the avocado in half and carefully remove the pit. Cut the avocado flesh into four quarters or scoop very large pieces into the bowl. Top with the lemon juice and massage the avocado into the kale, trying to leave some chunks of avocado intact.

Once everything is well-combined, give it a taste. Season with additional salt and black pepper, if needed. Top with any desired garnishes or add-ins, and enjoy!