Keto Croque Monsieur Recipe: Low-Carb French Ham & Cheese Sandwich

Keto Croque Monsieur. 3.8g carbs for the complete meal.

Hard to believe, right? With a zero‑carb sandwich bread and a simple béchamel alternative, you can enjoy a classic Croque Monsieur with very few carbs.

This version is quicker and lighter than the original and doesn’t require extra time in the kitchen, even if you make the bread from scratch.

If you want to give a ham and cheese sandwich a French, upscale twist or try a low‑carb take on this famous dish, this recipe delivers.

How to Make Keto Croque Monsieur

Begin by baking a zero‑carb sandwich bread recipe, using only half the batch and shaping it into six large, relatively flat buns as shown in the photos below.

Toast two buns in a buttered frying pan, one at a time, pressing them gently with a spatula until golden. This takes only a few minutes.

For a fast béchamel hack, mix Dijon mustard into crème fraîche. It adds creaminess and tang without the extra flour and time required for a traditional sauce.

Yes, purists may argue that only béchamel makes a true Croque Monsieur, but crème fraîche gives a very similar mouthfeel and keeps the recipe firmly low‑carb.

Assemble the sandwich: place one toasted bun upside down on a baking tray, spread half the crème fraîche mixture, add prosciutto cotto and a generous layer of gruyère, then top with the second toasted bun (also upside down). Spread the remaining crème fraîche across the top and a little over the edges to prevent scorching, then grate Parmigiano Reggiano over everything.

Finish under a hot grill until the cheese inside melts and the top turns a deep, golden brown. Serve immediately while the cheese is oozing and the top is caramelised.

Et voilà. Prêt à manger. Enjoy!