Preheat and prep: Heat the oven to 375°F (190°C).
Lightly grease a 9x13-inch baking dish.
Make the quick seasoning: In a small bowl, mix 2 teaspoons chili powder, 1 teaspoon cumin, 1/2 teaspoon smoked paprika, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/2 teaspoon salt, and 1/4 teaspoon black pepper.
Sauté the veggies: Warm oil in a skillet over medium heat. Add onion and bell pepper; cook 4–5 minutes until softened. Stir in jalapeño and half the seasoning; cook 1 minute.
Remove from heat.
Shred the chicken: Pull the rotisserie chicken into bite-size pieces. Toss with the remaining seasoning and the canned green chiles if using.
Mix the sauce: In a bowl, stir together Greek yogurt and salsa until smooth. Taste and add a pinch of salt if needed.
Assemble the base: If using low-carb tortillas: Layer 2–3 tortillas on the bottom of the baking dish, tearing to fit.
If using cauliflower rice: Spread 1.5 cups cooked cauliflower rice across the bottom of the dish.
Layer it up: Spread half the chicken over the base, top with half the veggies, spoon over half the yogurt-salsa sauce, and sprinkle with 1 cup cheese.
Repeat with remaining layers.
Bake: Cover loosely with foil and bake 15 minutes. Remove foil and bake another 8–10 minutes, until the cheese is bubbly and lightly browned.
Finish and serve: Let it rest 5 minutes. Squeeze lime over the top, shower with cilantro, and slice.
Serve with extra salsa, avocado slices, or a dollop of yogurt if you like.