01 - In a large mixing bowl, mash the avocado lightly with a fork or potato masher, leaving some chunks for texture.
02 - Add the cooled rice, shredded cheddar cheese, eggs, flour, green onions, garlic powder, salt, black pepper, and herbs into the bowl. Mix thoroughly until the mixture becomes cohesive and holds together.
03 - Pour 1 tablespoon oil into a large nonstick skillet and set over medium heat until shimmering.
04 - Scoop out roughly 1/4 cup of the mixture per portion and form into compact patties to yield about 8 evenly sized cakes.
05 - Arrange several patties in the skillet without overcrowding. Fry for 3 to 4 minutes on each side until golden brown and crisp, adding more oil and working in batches if required.
06 - Transfer cooked cakes onto a paper towel-lined plate to absorb excess oil. Serve warm with optional sour cream or a squeeze of lime if desired.