Start by peeling potatoes. Slice them into ⅛ to ¼ thick slices.
Place potatoes in a pot and cover with water. Bring to a boil and boil for 2 minutes.
Drain potatoes well. You do not want to drop wet potatoes into hot oil. Let them sit in a colander over a plate, while you heat up oil and butter.
Heat up half of the oil and butter in a large skillet.
Add potato slices and onions in batches. Do not overcrowd the pan or the slices won't cook crispy.
Fry until golden brown, turning them over as needed. Remove done slices as you go. Repeat until all potatoes are fried. Add garlic with the last part of the potatoes.
Garnish with parsley.
Serve.
Notes
Boil the potatoes for exactly 2 minutes. You do not want them cook all the way through since you will finish that process in the pan.
These potatoes are the best served right away, since they will have the perfect texture: crispy on the outside, soft on the inside.
I recommend counting 1 potato per person, when deciding on larger serving size.
Please note, that the nutrition value can vary depending on what product you use. The information below is an estimate. Always use calorie counter you are familiar with.