Heat olive oil in a large skillet over medium heat.
Add diced onions and sauté until translucent.
Stir in the diced bell peppers and cook until softened.
Season with salt and pepper to taste.
Create four wells in the vegetable mixture.
Crack an egg into each well.
Cover the skillet and cook until eggs are set, about 5-7 minutes.
Sprinkle chopped parsley on top for freshness.
If desired, add cheese on top just before serving.
Serve hot, garnished with additional parsley or avocado slices.