Creating your Egg Tortilla Bake is a straightforward process if you follow these simple steps:

1. Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with cooking spray or olive oil.
2. Sauté Vegetables: In a skillet over medium heat, add olive oil. When hot, add the diced onion and bell pepper. Sauté for about 5-7 minutes, until softened.
3. Prepare Egg Mixture: In a large bowl, whisk together the eggs, milk, cumin, chili powder, salt, and black pepper until thoroughly combined.
4. Layer Tortillas: Cut the corn tortillas into quarters. Lay half of them in the prepared baking dish, covering the bottom.
5. Add Half of the Cheese: Sprinkle half of the shredded cheddar cheese over the tortillas.
6. Layer Vegetables and Beans: Add the sautéed vegetables and black beans evenly over the cheese.
7. Repeat Layers: Place the remaining tortilla quarters on top, followed by the remaining cheese.
8. Pour Egg Mixture: Carefully pour the egg mixture over the layers, making sure to soak everything.
9. Bake: Place the baking dish in the preheated oven. Bake for 35-40 minutes, or until the eggs are set and the top is golden brown.
10. Cool Down: Remove from the oven and let it cool for about 10-15 minutes before slicing.
11. Garnish: Top with fresh cilantro, if desired, prior to serving.

These steps will guide you to create this delicious Egg Tortilla Bake effortlessly.