Prep the veggies: Dice the onion and bell pepper, mince the garlic and jalapeño. If ricing cauliflower from a head, pulse florets in a food processor until fine.
Make the taco seasoning: In a small bowl, combine chili powder, cumin, smoked paprika, oregano, garlic powder, onion powder, cayenne (if using), and salt.
Brown the turkey: Heat 1 tablespoon oil in a large skillet over medium-high.
Add ground turkey, breaking it up with a spatula. Season lightly with salt and pepper. Cook until no longer pink and edges begin to brown, about 5–7 minutes.
Add aromatics: Stir in onion, bell pepper, jalapeño, and garlic.
Cook 3–4 minutes until softened and fragrant, stirring occasionally.
Season and simmer: Sprinkle the taco seasoning over the turkey mixture. Stir to coat. Add 1/3 cup water or broth and simmer 2–3 minutes until the liquid reduces and clings to the meat.
Cook the cauliflower rice: In a separate large skillet, heat the remaining 1 tablespoon oil over medium-high.
Add riced cauliflower with a pinch of salt and pepper. Sauté 5–7 minutes, stirring often, until tender with a little bite and most moisture cooks off.
Assemble in oven-safe bowls: Divide cauliflower rice among 4 bowls or meal-prep containers. Spoon the turkey mixture on top.
Add the melt: Sprinkle shredded cheese evenly over each bowl.
Place bowls on a sheet pan and broil on high for 1–3 minutes, watching closely, until the cheese is bubbly and lightly golden. If you prefer, cover the skillet with a lid for 1–2 minutes to melt instead of broiling.
Top and serve: Add avocado, sour cream, salsa, cilantro, or your favorite toppings. Finish with a squeeze of lime and a dash of hot sauce.