Roast the poblano pepper over an open flame or in the oven.
Peel off the skin, take out the seeds, and chop it up.
Whisk the eggs, milk, salt, and pepper in a bowl.
Heat the skillet and add butter or oil.
Cook the onions and bell peppers until they’re soft.
Add the diced poblano pepper and cooked beef.
Pour the egg mixture into the skillet.
Let the eggs cook without stirring too much.
Sprinkle cheese on top of the eggs.
Fold the omelette in half gently.
Cook until the cheese melts and the eggs are set.
Serve with optional toppings like avocado slices.