Heat olive oil in a medium saucepan over medium heat. Add the minced garlic and cook for about 1 minute.

Stir in the rice, salt, cumin, onion powder, and water. Increase the heat to high, bring the mixture to a boil, then cover, reduce to low, and let simmer for 13-17 minutes.

Remove the pan from heat and let it stand, covered, for 5 minutes. Fluff the rice with a fork, then stir in the lime zest, lime juice, and cilantro. Gently fold in the mashed avocados and adjust salt to taste. Garnish with additional cilantro.