Prepare the bread slices.
Mix eggs, low-fat milk, and erythritol together in a bowl.
Pour the custard mixture evenly over the bread.
Heat a pan over medium-low heat and add olive oil.
Place the bread in the pan, cover with a lid, and cook for 5-7 minutes.
Flip the bread and cook for an additional 2-3 minutes until the outside is golden brown.
Transfer to a plate and serve.