Wash the potatoes thoroughly and cut into 5 mm thick slices.
Grease a baking sheet with vegetable oil put potato slices. Salt to taste. Peel the garlic, crush it in a mortar, or press. Add basil and oil, stir.
Lubricate the potatoes with plenty of spicy butter with a silicone brush. Wash the tomatoes, cut into slices, lay on top of the potatoes, add a little salt.
Peel the onion, cut into rings, place on the tomatoes, creating the illusion of a serpentine. Sprinkle lightly with oil.
Bake potato casserole with tomatoes in an oven preheated to 200 degrees for 20-25 minutes.