Preheat the oven to 400F.
Chop the onion and garlic and cut the peppers in brunoise (small squares).
In a hot skillet, pour a little bit of olive oil and sauté the garlic, onion, and peppers for 4-5 minutes or until tender.
Add in the sausage meat and cook until no longer red and break the meat into small pieces. Add the taco seasoning, stir well and set aside.
Drain the water from the cans for the corn and black beans.
In a bowl, mix the corn, black beans, diced tomato, and green onion. Set aside.
In a mixing bowl, crack all your eggs and whisk them with the milk. Set aside also.
Cut your tortillas into quarters.
In a 9x13" baking dish, spray with cooking oil or spread some oil with a brush.
Place the tortilla quarters, so the center of the tortilla is in the corner of the dish (see the picture in the post).
Spread a third of the sausage mixture, then a third of the corn/bean mixture, and then sprinkle with cheese. Pour about a third of the eggs.
Repeat 2 more times or until you do not have any more ingredients.
Cover with aluminum foil.
Bake it covered for 40 minutes and another 15 minutes uncovered.
Topping: Cube the avocado, dice the tomato, and chop the coriander. Combine all in a bowl and season with lime juice and salt. Serve on top of your breakfast casserole.