Add beans and their liquid, garlic, chili powder, cumin, and salt to a small pot and simmer on medium-low while you cook the cauliflower rice and mash the avocado. Stir often until they are no longer watery, about 20 minutes.
Warm olive oil in a large nonstick skillet. Add cauliflower rice, garlic, cumin, chili powder, and salt. Cook, stirring often, for 7 to 10 minutes, until tender.
In a small bowl, mash the avocado, lime juice, salt, and cilantro until smooth.
Divide cauliflower rice, beans, mashed avocado, and toppings between two bowls.