Heat the oven to 425°F. Set out a 9x13-inch baking dish. If your cauliflower rice is frozen, thaw it now and squeeze it in a clean towel until it stops dripping (this is the difference between a saucy filling and a watery one).
In a small saucepan, stir together the salsa verde, chicken broth, and lime zest. Warm over medium heat until steaming, 5 minutes. Turn the heat to low so it stays warm while you build everything.
grill the chicken
Pat the chicken dry. In a bowl, toss it with avocado oil, salt, cumin, smoked paprika, garlic powder, and lime juice. Let it sit while the grill heats (even 10 minutes helps).
Heat a grill or grill pan to medium-high heat. Grill the chicken until nicely charred and cooked through, 10 minutes total, flipping once. You're looking for firm but still juicy; if you have a thermometer, aim for 165°F at the thickest part.
Transfer chicken to a cutting board and rest 5 minutes (resting keeps the juices inside). Chop into small bite-size pieces or shred with two forks.
make the cauliflower rice filling
In a medium skillet over medium heat, warm the avocado oil. Add the chopped onion and poblano pepper with the salt. Cook until softened and glossy, 6 minutes.
Add the cauliflower rice and cumin. Cook, stirring often, until the cauliflower is tender and most of the moisture has cooked off, 8 minutes. If it still looks wet, keep going another minute or two; drier filling rolls better.
Scrape the cauliflower mixture into a mixing bowl. Stir in the black beans, chopped cilantro, jalapeño (if using), and the grilled chicken. Taste and adjust salt if needed.
assemble and bake
Pour 1/2 cup of the warm salsa verde sauce into the bottom of the baking dish and spread it around (this prevents sticking and gives you sauce in every bite).
Working one at a time, quickly dip each corn tortilla in the warm sauce (use tongs) to coat both sides. This softens the tortilla so it rolls without cracking and is a classic enchilada move that's worth the tiny mess.
Add about 1/2 cup filling down the center of each tortilla, roll it up snug, and place seam-side down in the baking dish. Repeat with the remaining tortillas and filling.
Pour the remaining sauce evenly over the enchiladas, making sure the edges are covered so they don't dry out. Sprinkle the cheese over the top.
Bake until bubbling and the cheese is melted, 20 minutes. Let the pan rest 5 minutes before serving so the sauce thickens slightly and the rolls hold together.
finish and serve
Top with extra cilantro and a little chopped red onion if you like. Serve with avocado and a big squeeze of lime. If you want that creamy contrast, dollop on greek yogurt or sour cream right before eating.
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