Slice the sweet Potatoes and cut them length wise.
Also Cut the potatoes length wise
Dip them in a bowl of water cold and a pinch of salt.

Strain the water and place all the potato slices on a baking tray lined with a sheet.
Add a teaspoon of oil and sprinkle salt all over.
Bake at 160⁰ C for 20-30 minutes.
You can flip the potatoes at 15 minutes to get the brown color from both sides.

For the dip,
In a bowl, add yogurt, mustard sauce, oil and oregano and mix together well.