Heat a large lipped skillet over medium-high heat. Add olive oil, peppers and onion. Saute 2-3 minutes until vegetables begin to soften. Push veggies to exterior edges of the skillet and add ground meat in the middle- breaking up uniformly to brown.
Sprinkle atop taco seasoning, salt and pepper while you continue to brown the meat and saute the vegetables together. Turn heat down, if needed.
After beef is cooked, stir in cauliflower rice, coating well in the fat and juices. Saute 5-6 minutes, stirring occasionally, until cauliflower rice has released water.
Stir in fire roasted tomatoes and corn, turn heat to low and simmer, stirring occasionally, until flavors have melded and skillet has thickened, 15-20 minutes.
Garnish with fresh sliced avocado and cilantro. Serve solo or with tortilla chips on the side.