In a pan, heat olive oil over medium heat and sauté garlic until golden brown.
Add chopped onion and cook until softened.
Pour in the broth and bring to a simmer. Cook for 15 minutes.
Blend the mixture until smooth using an immersion blender.
In a bowl, whisk egg yolks with heavy cream. Slowly add some hot soup to temper.
Stir the egg mixture back into the soup and heat gently without boiling.
Season with salt, pepper, thyme, and nutmeg.
Serve hot with toasted French bread and a sprinkle of Parmesan cheese.