Preheat oven to 350°F (175°C).

Coat a shallow 1-quart casserole dish with cooking spray.

In a large bowl, whisk together the eggs, sliced mushrooms, chopped green chilies, diced cooked bacon, and shredded Monterey Jack pepper cheese.

Pour the egg mixture into the prepared casserole dish.

Bake uncovered in the preheated oven for 20 minutes, or until the omelet is set.

Remove from oven and let cool slightly.

Cut the omelet into 1-inch squares.

Serve warm or at room temperature with toothpicks for easy serving.