In a resealable bag, combine finely diced red onion, jalapeño, and garlic with a pinch of kosher salt. Seal the bag while removing excess air, then smash the contents using a rolling pin or a heavy object for about 1-2 minutes until the juices are released and everything is well blended.

In a mixing bowl, scoop out the creamy flesh of ripe avocados. Add the smashed aromatics from the bag, fresh lime juice, chopped cilantro, a sprinkle of salt, garlic powder, and Tajín. Mix everything together.

Using a sturdy spoon or fork, mash the avocado mixture until you achieve your desired level of creaminess—aiming for a combination of creamy and chunky textures.

Transfer your vibrant guacamole to a serving dish and garnish with additional cilantro on top. Serve immediately with crispy tortilla chips or as a topping for tacos and salads.