Easy Vegetarian Mexican Breakfast Casserole Recipe

This Easy Vegetarian Mexican Breakfast Casserole is a hearty make-ahead breakfast made with eggs, corn tortillas, black beans, salsa, bell pepper, onion, green chiles, and melted Mexican-blend cheese. It serves 8, takes about 15–20 minutes to prepare, bakes at 350°F for 35–45 minutes, and rests for 5–10 minutes before slicing.

Every bite is savory, cheesy, and gently spiced, with tender tortillas that soak up the seasoned egg mixture and colorful vegetables throughout. Serve it with avocado, extra salsa, sour cream, cilantro, or sliced jalapeños for a filling Mexican-inspired breakfast that works beautifully for holidays, weekend brunch, and busy mornings.

Why You’ll Love This Recipe

This casserole brings the comfort of a traditional egg bake together with the bold, familiar flavors of Mexican-style breakfast cooking. Corn tortillas form tender layers beneath creamy eggs, while black beans add substance and the vegetables bring color, sweetness, and a little bite.

It is also wonderfully practical. The entire dish comes together in one baking pan, feeds 8 people, and can be assembled the night before, making it a reliable choice when you want a hot breakfast without standing over the stove.

If you enjoy simple oven-baked morning meals, you may also like this easy breakfast casserole for another comforting option.

Ingredients You’ll Need

The ingredient list is straightforward, but each component has an important role. The eggs and milk create a soft custard, the tortillas absorb the seasoned mixture, and the beans and vegetables make each square hearty enough to serve as a complete breakfast.

• Eggs and milk: Ten large eggs provide the structure, while one cup of milk keeps the center tender and creamy.
• Corn tortillas: Eight small tortillas give the casserole a lightly chewy, enchilada-like texture and a warm corn flavor.
• Black beans: One drained and rinsed 15-ounce can adds fiber, protein, and a satisfying contrast to the eggs.
• Vegetables: Diced bell pepper, onion, and canned green chiles provide color and savory flavor without making the preparation complicated.
• Salsa: One cup of mild or medium salsa seasons the layers and supplies a pleasant tomato-pepper tang.
• Cheese: A total of 1 1/2 cups of Mexican-blend, cheddar-Monterey Jack, Monterey Jack, or cheddar cheese melts into the layers and across the top.
• Seasonings: Chili powder, cumin, salt, and black pepper give the eggs a warm, balanced flavor.

Drain the beans, salsa, and green chiles carefully. Excess moisture is the most common reason a breakfast casserole stays watery in the middle.

For a more substantial brunch table, serve this casserole beside fresh fruit or warm bread. Our easy beer bread can make a hearty companion when you want something savory on the side.

How to Make It Step-by-Step

Step 1: Heat the oven to 350°F (175°C), then grease a 9 x 13-inch baking dish with butter, oil, or cooking spray. Greasing the dish helps the edges release neatly after the casserole rests.

Step 2: Cut the corn tortillas into quarters or strips and set them aside. In a medium bowl, whisk the 10 eggs with the milk, chili powder, ground cumin, salt, and black pepper until the mixture looks evenly blended.

Step 3: Arrange half of the tortilla pieces across the bottom of the prepared baking dish. They do not need to form a perfect single layer, but distribute them as evenly as possible so every serving has some tortilla.

Step 4: Scatter half of the drained black beans, diced bell pepper, diced onion, and drained green chiles over the tortillas. Spoon half of the salsa across the vegetables, then sprinkle with half of the shredded cheese.

Step 5: Repeat the arrangement with the remaining tortilla pieces, beans, bell pepper, onion, green chiles, salsa, and about 1 cup of the cheese. Keeping the layers balanced helps the finished slices hold together instead of having all the filling collect in one area.

Step 6: Pour the seasoned egg mixture slowly and evenly over the entire casserole. Use a spatula to press the top gently, allowing the tortillas to absorb some of the eggs without compacting the layers too firmly.

Step 7: Sprinkle the remaining cheese over the surface. Bake the dish uncovered for 35–45 minutes, checking toward the end of the baking range; the center should be set, no longer liquid, and approximately 160°F.

Step 8: Remove the casserole from the oven and let it stand for 5–10 minutes. Finish with the optional chopped cilantro, slice into 8 portions, and serve with extra salsa, avocado, sour cream, Greek yogurt, green onions, cilantro, or jalapeños.

Chef Tips for the Best Texture

Sautéing the onion and bell pepper for 4–5 minutes before layering is optional, but it gives the vegetables a softer texture and a sweeter, more developed flavor. Allow them to cool briefly before adding them to the dish so they do not warm the raw egg mixture prematurely.

Choose mild or medium salsa for a family-friendly casserole, or use hot salsa when you want more heat. A diced jalapeño or pepper Jack cheese can also increase the spice, while Monterey Jack keeps the flavor gentle and the topping especially melty.

Corn tortillas give the casserole its more traditional enchilada-like character, but flour tortillas can be used in variations. Diced tomatoes, corn, spinach, sautéed zucchini, frozen hash browns, or cooked potatoes are also common additions, though they may change the moisture and texture.

Do not judge doneness by the browning of the cheese alone. The top may look ready before the center has set, so test the middle with a thermometer or a knife; approximately 160°F indicates the egg custard is cooked.

Make-Ahead, Storage, and Reheating

To assemble the casserole the night before, layer all the ingredients in the greased baking dish, pour over the egg mixture, and cover tightly. Refrigerate it overnight, then bake as directed while allowing roughly 5–10 additional minutes because the dish begins cold.

For the best results, let a refrigerated casserole sit out only briefly while the oven preheats, and do not leave raw egg mixtures at room temperature for an extended period. Bake until the center is fully set and reaches approximately 160°F.

Store leftovers covered in the refrigerator and reheat individual portions until hot. Add fresh salsa, avocado, cilantro, or a spoonful of sour cream after reheating to refresh the flavors.

For a different kind of comfort-food casserole, see our cheesy Big Mac-inspired casserole when planning a later lunch or dinner.

Serving Ideas and Flavor Variations

Set out a topping bar so everyone can customize their portion. Extra salsa adds brightness, sliced avocado brings cool creaminess, and sour cream or plain Greek yogurt balances the chili powder and green chiles.

• Add chopped green onions for a fresh, mild onion flavor.
• Use cilantro before serving for a herbal finish.
• Offer sliced jalapeños for guests who prefer extra heat.
• Pair each serving with fresh fruit for a colorful brunch plate.
• Use pepper Jack instead of the Mexican-blend cheese for a spicier variation.

The casserole is substantial enough to stand alone, but it also works well as part of a larger breakfast spread. After brunch, keep something sweet in mind, such as this pineapple banana dessert for a fruit-forward finish.

Easy Vegetarian Mexican Breakfast Casserole

A cheesy, savory breakfast casserole layered with corn tortillas, black beans, vegetables, salsa, and seasoned eggs. This make-ahead-friendly dish serves 8 and is ideal for brunch.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 35 minutes mins

Total Time 1 minute min

Servings: 8 servings

Ingredients Method Notes

Ingredients

  

Egg Mixture

• 10 large Large eggs
• 1 cup Milk
• 1 teaspoon Chili powder
• 1/2 teaspoon Ground cumin
• 1/2 teaspoon Salt
• 1/4 teaspoon Black pepper

Casserole

• 8 small Small corn tortillas, cut into quarters or strips
• 1 15-ounce can Black beans, drained and rinsed
• 1 cup Mild or medium salsa
• 1 small Small bell pepper, diced
• 1/2 cup Diced onion
• 1 4-ounce can Diced green chiles, drained
• 1 1/2 cups Mexican-blend cheese or cheddar-Monterey Jack cheese, divided
• 2 tablespoons Chopped cilantro

For Serving

• As needed Additional salsa
• As needed Sliced avocado
• As needed Sour cream or plain Greek yogurt
• As needed Chopped green onions or cilantro
• As needed Sliced jalapeños

Method

 

Step-by-Step

1. Heat the oven to 350°F (175°C) and grease a 9 x 13-inch baking dish.
2. Whisk the eggs, milk, chili powder, cumin, salt, and black pepper in a bowl until evenly combined.
3. Layer half of the tortilla pieces in the prepared baking dish. Add half of the black beans, bell pepper, onion, green chiles, salsa, and shredded cheese.
4. Repeat the layers with the remaining tortillas, vegetables, beans, salsa, and about 1 cup of the cheese.
5. Pour the egg mixture evenly over the casserole. Press the top gently with a spatula so the tortillas absorb some of the egg mixture, then sprinkle with the remaining cheese.
6. Bake uncovered for 35–45 minutes, until the center is set and no longer liquid. The center should reach approximately 160°F.
7. Let the casserole stand for 5–10 minutes before slicing. Garnish with cilantro and serve with salsa, avocado, or other desired toppings.

Notes

Drain salsa and green chiles well to prevent a watery casserole. For better texture, sauté the onion and bell pepper for 4–5 minutes before layering. To assemble the night before, cover and refrigerate, then add roughly 5–10 minutes to the baking time.

Final Thoughts

This Easy Vegetarian Mexican Breakfast Casserole is the kind of dependable recipe that earns a regular place in a breakfast rotation. It combines simple pantry ingredients with colorful vegetables, seasoned eggs, creamy melted cheese, and tender corn tortillas for a dish that feels special without requiring complicated preparation.

Remember to drain the wet ingredients well, press the tortillas gently into the egg mixture, and allow the casserole to rest before slicing. With extra salsa, avocado, and fresh herbs on the table, every serving can be finished exactly the way your guests like it.