In a small saucepan, combine chicken broth, oregano, cumin, garlic powder, onion powder, black pepper, salt, cayenne pepper, chili powder, and flour. Whisk until combined.
Heat over medium-low until thickened, whisking occasionally. Remove from heat and transfer to a bowl.
In a skillet, heat olive oil over medium heat. Sauté red bell pepper and onion until tender, about 5-7 minutes.
Add shredded chicken, corn, and black beans. Stir until heated through, about 4-5 minutes.
Prepare pasta according to package instructions, then drain.
Preheat oven to 350°F (175°C).
In a large bowl, combine pasta, chicken mixture, and sauce. Toss to coat evenly. Stir in half of the cheese.
Transfer mixture to a 1 1/2 quart baking dish. Spread evenly and top with remaining cheese.
Bake for about 30 minutes, or until cheese is melted and bubbly.
Sprinkle with green onions and let cool for a few minutes before serving.
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Notes
Store leftovers in an airtight container for up to 3-4 days.