Combine the taco spices in a small bowl and set aside.
Heat a large skillet over medium high. Cook the ground beef until crumbled and almost browned (about 5 to 7 minutes).
Add the fajita vegetables, and continue to cook until the vegetables are soft (about 3 to 5 minutes). Stir in the spice mixture and tomato paste, plus 1 to 2 tablespoons of water if needed (this will depend on how much fat renders from your ground beef-- more lean= more moisture needed). Simmer to let the flavors combine, about 5 minutes
Steam the cauliflower rice until soft, either on the stovetop or in the microwave*. Squeeze half a lime over top and stir. Cover and set aside.
Assemble the burrito bowls with cauliflower rice on the bottom, topped with the fajita beef mixture. Top with your favorite garnishes & serve!