Preheat oven to 375ºF.

Heat a large nonstick pan over medium heat. Add olive oil, once hot, add the onions. Saute until translucent, 2 minutes.

Add the bell peppers and saute for 2 minutes.

Increase the heat to medium-high, add the beef, cook until browned, breaking the meat up until smaller pieces, about 4 to 5 minutes.

Sprinkle the paprika, cumin, salt, pepper, coriander, oregano, garlic powder, onion powder, chili powder, and flour. Stir and cook for 1 minute.

Slowly add the water and cook until the beef sauce is slightly thickened.

Add the corn and black beans, stir until combined.

Transfer the beef mixture to a 2-quart casserole dish, spread into an even layer.

Top the beef with crushed tortilla chips and cheese.

Bake until the cheese has melted, about 5 minutes.

Top the taco casserole with desired toppings, serve immediately.