To make a healthier and lower calorie Croque Monsieur, consider the following tips:

- Use whole grain bread instead of white bread.
- Reduce the amount of cheese used or opt for a lower-fat cheese.
- Use a lighter version of the béchamel sauce, made with skim milk.
- Add more vegetables to the sandwich, such as spinach or tomato.
- Bake or grill the sandwich instead of frying it.

Let me know if there is anything else I can help you with.
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