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Mexican Quinoa Casserole

Mexican Quinoa Casserole (One-Pan Meal)

This Mexican Quinoa Casserole is a one-pan, vegetarian-friendly dish packed with bold flavors, fiber-rich beans, protein-packed quinoa, and gooey cheese. With minimal prep and customizable ingredients, it's ideal for busy weeknights, meal prep, or potlucks.
Ready in under an hour, it's a hearty and healthy meal the whole family will love!
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Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Course Main Course
Cuisine Mexican
Servings 6 Servings
Calories 350 kcal

Ingredients
  

  • 1 cup quinoa rinsed
  • 1 can (15 oz) black beans, drained and rinsed
  • 1 cup corn frozen, fresh, or canned
  • 1 cup bell pepper diced (any color)
  • 1 small onion diced
  • 3 cloves garlic minced
  • 1 can (15 oz) diced tomatoes (with juices)
  • 1 ½ teaspoons ground cumin
  • 1 teaspoon chili powder
  • ½ teaspoon smoked paprika
  • ½ teaspoon dried oregano
  • ¼ teaspoon cayenne pepper optional
  • 1 ¾ cups vegetable or chicken broth
  • 1 ½ cups shredded cheese, cheddar, Monterey Jack, or plant-based
  • 1 tablespoon olive oil
  • Salt and pepper to taste

Optional toppings:

  • avocado, fresh cilantro, green onions, lime wedges

Instructions
 

  • Preheat the oven to 375°F (190°C).
  • Sauté aromatics: In a large oven-safe skillet, heat olive oil over medium heat. Add diced onion and garlic and sauté until softened, about 2–3 minutes.
  • Add veggies and spices: Stir in bell pepper, corn, black beans, diced tomatoes, cumin, chili powder, paprika, oregano, cayenne (if using), salt, and pepper. Cook for another 2–3 minutes.
  • Combine quinoa and broth: Add the rinsed quinoa and pour in the broth. Stir everything together until well combined.

Simmer or bake:

  • Stovetop method: Bring to a boil, then reduce heat to low, cover, and simmer for 20–25 minutes until quinoa is cooked and liquid is absorbed.
  • Baking method: Cover with foil and bake for 30 minutes, or until quinoa is fully cooked.
  • Add cheese: Remove foil (if baking), sprinkle shredded cheese evenly over the top, and return to oven uncovered. Bake for another 10 minutes, or until the cheese is melted and bubbly.
  • Serve: Let cool slightly before serving. Top with avocado, cilantro, green onions, or lime if desired.
Keyword Mexican Quinoa Casserole