Step 1: Prepare the Ground Beef Mixture

• In a large skillet over medium-high heat, cook the ground beef until browned, breaking it up as it cooks (about 6-8 minutes). Drain any excess fat.
• Add the diced onion, bell pepper, and minced garlic to the skillet. Sauté for another 5 minutes until the vegetables are soft and fragrant.
• Stir in the taco seasoning, cumin, chili powder, diced tomatoes with green chilies (including their juices), and black beans. Allow the mixture to simmer for 2-3 minutes to let the flavors blend.

Step 2: Cook the Rice

• While the beef mixture is simmering, cook the rice. In a medium pot, bring 2 cups of beef broth or water to a boil. Add the uncooked rice, cover, and reduce the heat to low. Let it simmer for about 15-20 minutes, or until the rice is tender and the liquid is absorbed.
• Fluff the rice with a fork when done and set aside.

Step 3: Combine the Ingredients

• Preheat your oven to 350°F (175°C).
• In a large mixing bowl, combine the cooked rice, beef mixture, condensed cheddar cheese soup, and half of the shredded cheddar cheese and Monterey Jack cheese. Mix well until everything is fully incorporated.
• Season with salt and pepper to taste.

Step 4: Assemble the Casserole

• Transfer the beef and rice mixture into a greased 9×13-inch baking dish. Spread it out evenly.
• Top the casserole with the remaining shredded cheddar and Monterey Jack cheese.

Step 5: Bake the Casserole

• Cover the dish with aluminum foil and bake in the preheated oven for 25 minutes.
• After 25 minutes, remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly.

Step 6: Add the Toppings

• Once the casserole is done baking, remove it from the oven and allow it to cool slightly for 5 minutes.
• Sprinkle the sliced jalapeños over the top, followed by the crushed tortilla chips for a nice crunch.

Step 7: Make the Dressing

• While the casserole is cooling, prepare the sour cream dressing. In a small bowl, mix together the sour cream and the juice of one lime. Stir until smooth and creamy.
• Adjust the lime juice to taste. Set aside for serving.

Step 8: Serve and Enjoy

• Slice or scoop the casserole into portions and serve with a generous dollop of the lime-infused sour cream. If desired, add an extra squeeze of lime juice over the top for added brightness.