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#### 1. Preheat and Prepare:
1. Preheat your oven to **375°F (190°C)**.
2. Grease a 9×13-inch casserole dish and set it aside.
#### 2. Cook the Meat Mixture:
1. In a large skillet, heat over medium-high heat and cook the **ground beef** and diced **onion** until the beef is browned and the onions are softened, about **7-8 minutes**.
2. Drain any excess fat.
3. Stir in the **taco seasoning**, **diced tomatoes**, and **salsa**. Let the mixture simmer for **5 minutes**.
#### 4. Bake:
1. Cover the casserole with foil and bake for **20 minutes**.
2. Remove the foil and bake for an additional **10 minutes**, or until the cheese is melted and bubbly.
#### 5. Serve:
1. Let the casserole cool for **5 minutes** before serving.
2. Top with **sour cream**, **cilantro**, and your favorite garnishes.
3. Serve hot and enjoy!
### Tips for Success
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1. **Versatile**: You can easily tailor the ingredients to fit your pantry or preferences.
2. **Family-Friendly**: Kids and adults alike love the cheesy, crunchy, and savory layers.
3. **Easy to Make**: With simple steps and minimal prep time, this casserole is perfect for busy evenings.
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This **Mexican Casserole Recipe** combines everything you love about Tex-Mex cuisine into one satisfying dish. It’s loaded with layers of flavor, easy to prepare, and perfect for sharing. Pair it with a crisp side salad, guacamole, or a margarita for a complete meal that everyone will adore. Try it tonight, and watch it become a regular on your dinner table!