Step 1

Warm the butter in a skillet or frying pan over medium heat. Sauté thinly sliced onion for 2 minutes until translucent.

Step 2

Add the ground beef and cook until browned. Break it apart with a spatula as needed.

Step 3

Remove onion beef mixture and set aside.

Step 4

Whisk eggs and salt in a bowl.

Step 5

Pour the eggs into the pan and cook without disturbing until the egg sets. It takes about 3 minutes over medium heat.

Step 6

Arrange the meat over one-half of the eggs. Sprinkle half of the cheese on top and fold the omelette over. Lower heat, top with remaining cheese, and cover with a lid. Continue cooking until cheese melts completely.

Step 7

Remove from heat, arrange on a plate and serve warm.