01 - In a large mixing bowl, mash the avocado gently with a fork, leaving some chunks for added texture.
02 - Add cooled rice, shredded cheddar cheese, eggs, flour, sliced green onions, garlic powder, salt, black pepper, and chopped herbs. Mix thoroughly until the mixture is cohesive and can hold its shape.
03 - Pour 1 tablespoon of oil into a large nonstick skillet and set over medium heat.
04 - Using a measuring cup, portion about 1/4 cup of mixture for each rice cake. Gently shape into compact patties, forming approximately 8 cakes.
05 - Place patties in the hot skillet, spacing them to avoid overcrowding. Cook each side for 3 to 4 minutes, turning once, until the exterior is golden brown and crisp. Add additional oil as needed and fry in batches if necessary.
06 - Transfer finished cakes to a plate lined with paper towels to drain excess oil. Serve warm, optionally with sour cream or a squeeze of lime.