Add the ground beef and diced onion to a large cast iron skillet over medium heat. Cook, breaking up the beef with a spoon, until the beef is browned and the onion is softened, about 8–10 minutes. Drain excess fat if needed.
Stir in the garlic and chopped red bell pepper and cook for 2–3 minutes, until fragrant and slightly softened. Add the paprika, cumin, and chili powder and stir for 30 seconds to toast the spices.
Add the black beans, corn, and salsa and stir until well combined. Let the mixture simmer for several minutes, until heated through.
Tuck the quartered tortilla pieces evenly throughout the skillet so you get bits of tortilla in every bite.
Sprinkle the shredded cheese evenly over the top and place the skillet under the broiler for 3–5 minutes, until the cheese is melted and bubbly.
Serve topped with chopped green onions and sliced jalapeños, if desired.
Notes
The salsa adds most of the moisture and flavor to the skillet, so use one you already enjoy eating on its own. A thicker salsa will make the skillet heartier, while a thinner salsa creates a saucier texture.
This recipe reheats well for lunches the next day. The tortillas soften more as it sits, giving leftovers an almost enchilada-style texture.