Potato Gratin, Mum recipe one of the best, simple and easy

One of my best childhood meals, love it and wanted to share it with you, hope you will like it, let me know !
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Ingredients:
3 POTATOES
FOR THE STUFFING: 1 SMALL ONION
2 GARLIC CLOVES
2 TABS OF OLIVE OIL
400 G OF MINCED MEAT
SALT AND PEPPER
BECHAMEL SAUCE: 2 Tbsp BUTTER, 2 Tbsp FLOUR, MILK, SALT, PEPPER, NUTMUG
PARSLEY AND EMMENTAL CHEESE
MOZZARELLA AND EMMENTAL CHEESE
IN THE OVEN 30 TO 35 MIN 180 ° C