Make the cauliflower into rice by pulsing florets in a food processor ( I work in two batches ) until it resembles rice, about 10-15 pulses. Place it in a bowl and set aside
Heat the olive oil in a large skillet over medium low heat. Add the diced onion and peppers and sauté until soft, about 5 minutes. Stir in minced garlic and cook for another minute, stirring. Add the cumin, garlic powder and cayenne and stir to combine everything
Add the cauliflower rice, stir, reduce heat to low and cover the pan. Let cook for 5-8 minutes, checking for desired tenderness
Stir in the salsa and fresh cilantro and garnish with avocado slices