Preheat the oven to 350°F (175°C).
In a large skillet, brown the ground beef over medium heat. Drain any excess fat.
Add the diced bell pepper, chopped onion, and minced garlic to the skillet. Sauté until the vegetables are tender, about 5 minutes.
Stir in the chili powder, cumin, paprika, salsa, sour cream, salt, and pepper. Cook for another 3-4 minutes, allowing the flavors to meld.
In a casserole baking dish, layer half of the tortilla chips evenly at the bottom.
Spoon half of the beef mixture over the chips, and sprinkle in half of the shredded cheddar cheese.
Repeat the layers with the remaining tortilla chips, beef mixture, and top with the remaining cheese.
Cover the casserole with aluminum foil and bake in the preheated oven for 20 minutes.
Remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
Once done, remove from the oven and let it sit for a few minutes before serving. Sprinkle with chopped cilantro if desired.