Preheat oven to 400°F (200°C).
Spread riced cauliflower on a large rimmed baking sheet and toss with 1 tablespoon olive oil and 0.5 teaspoon salt.
Roast cauliflower for 15 to 20 minutes, stirring halfway through, until edges are golden brown and tender.
Heat remaining 1 tablespoon olive oil in a large cast-iron skillet over medium-high heat.
Add ground beef to the skillet and spread into an even layer; let sear undisturbed for 5 minutes to develop a crispy crust.
Break the beef into small crumbles and stir in chili powder, smoked paprika, cumin, garlic powder, cayenne, black pepper, and remaining salt.
Cook for an additional 3 to 5 minutes until the beef is fully browned and texture is crispy.
Divide the roasted cauliflower rice into four bowls.
Top each bowl with the crispy chile beef, diced red pepper, red onion, and avocado slices.
Garnish with fresh cilantro and serve immediately with lime wedges for squeezing.