Add the butter to a hot pan.

As the butter begins to melt, slice the onion into thin strips.

Once the butter is browned, add the onions and give them some time to caramelize.

Once the onions are translucent, add the spinach, letting it cook down and wilt. Season with salt and pepper to taste.

Remove the spinach and onion mixture from the pan and set aside. Crack the eggs into a measuring cup or another pourable container.

Add the heavy cream, salt, and pepper to the eggs. Mix well.

Reduce the heat to medium-low. Add the egg mixture to the pan and allow it to cook.

Once the edges begin to set, add the onion and spinach mixture back, placing it on one half of the omelet. Crumble the goat cheese on top of the spinach and season to taste.

Fold the omelet in half once the top has begun to set, then serve! Optional: Garnish with green onions.