Easy Cheesy Mexican Ground Beef Casserole with Corn Tortillas Step-by-step instructions

Before you start

Before beginning the cooking process, gather all ingredients and measure them out to ensure a smooth workflow. Preheat the oven to 375°F (190°C) so it is hot and ready when the assembly is complete. Lightly grease a 9x13-inch baking dish with non-stick cooking spray or a brush of oil.

Chop the fresh tomatoes and cilantro for the final garnish and set them aside. Drain and rinse the canned beans thoroughly. Grate the cheddar and Monterey Jack cheeses and keep them in separate bowls for easy layering.

Instructions

Prep and Cook the Spiced Beef

1. 1Brown the Ground Beef
   Preheat the oven to 375°F (190°C). Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it up with a wooden spoon, until it is completely browned and no longer pink. Ensure the beef reaches a safe internal temperature of 160°F (71°C) during this browning process. Drain any excess grease from the skillet to keep the casserole from becoming oily.
   Look for The meat is fully browned with no pink remaining.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Use a flat-edged wooden spoon to break the beef into small, uniform crumbles.
2. 2Season the Beef
   Reduce the heat to medium-low. Sprinkle the taco seasoning over the browned ground beef and stir well to coat the meat evenly. Pour in a splash of water if needed to help distribute the spices, and simmer for 2 to 3 minutes until the seasoning is fully absorbed and fragrant.
   Look for The meat is highly fragrant and evenly coated with spices.
   Tip Adjust the seasoning level to taste, adding a pinch of chili powder for extra heat if desired.

By the end of this phase, the ground beef is beautifully browned, crumbled, and thoroughly coated in aromatic taco spices. The kitchen should smell rich with cumin, chili powder, and garlic.

Ensure there is no excess moisture or grease left in the skillet, leaving you with dry, flavorful seasoned beef that is ready to be layered.

Assemble the Casserole Layers

3. 3Layer the Tortillas, Beans, and Beef
   Begin assembling the casserole in the prepared baking dish. Lay down half of the corn tortillas in an even layer across the bottom, overlapping them slightly to cover the base completely. Spread all of the drained beans evenly over the tortilla layer, followed by the seasoned ground beef.
   Look for The bottom of the dish is completely covered and layered evenly.
   Tip Cut some tortillas in half to fill any gaps along the edges of the dish.
4. 4Add the Top Layer and Cheese
   Place the remaining corn tortillas over the beef layer. Sprinkle the shredded Monterey Jack and cheddar cheeses evenly over the top, creating a thick, colorful blanket of cheese that covers the entire surface of the casserole.
   Look for The cheese completely covers the tortillas and beef beneath it.
   Tip Mix the two cheeses together before sprinkling for a beautiful marbled look.

At this point, all the layers are neatly assembled in the baking dish. The corn tortillas form a sturdy base, topped with a thick layer of beans and beef, followed by another tortilla layer and a heavy blanket of shredded Monterey Jack and cheddar. The cheese should cover every inch of the top, ready to melt into a golden crust.

Bake, Garnish, and Rest

5. 5Bake the Casserole
   Transfer the assembled casserole to the preheated oven. Bake at 375°F (190°C) for 15 to 20 minutes, or until the cheese is completely melted, bubbling at the edges, and starting to turn golden brown in spots.
   Look for The cheese is molten, bubbly, and golden around the edges.
   Tip For a deeper golden crust, pop the dish under the broiler for the last 2 minutes of baking.
6. 6Garnish and Serve
   Remove the casserole from the oven and let it rest for 5 minutes. Garnish the top with the diced tomatoes and fresh chopped cilantro just before slicing and serving warm.
   Look for The casserole is rested, beautifully garnished, and ready to slice.
   Tip Letting the casserole rest helps the layers set, making it much easier to slice cleanly.

The casserole emerges from the oven hot, steaming, and incredibly fragrant. The cheese is completely melted, bubbling vigorously along the sides of the dish, and showing beautiful golden spots. After a brief rest, the fresh red tomatoes and green cilantro add a bright, colorful finish to the golden surface.

Common mistakes

One common mistake is failing to drain the excess fat from the ground beef after browning. Leaving too much grease in the meat will cause the corn tortillas to become soggy and greasy, making the final casserole heavy and wet.

Another frequent error is using cold tortillas directly from the package without warming or overlapping them properly, which can lead to dry spots or gaps in the structure of the layers.

How to tell it’s done

The casserole is perfectly cooked when the cheese on top is completely melted, bubbly, and lightly browned around the edges.

Since the ground beef was already cooked to a safe internal temperature of 160°F (71°C) in the skillet, the baking process is primarily to heat the layers through and melt the cheeses together. The entire dish should be hot and steaming throughout when pierced with a knife.

• Ground meat: 160°F (71°C) in the thickest part