Begin by thoroughly washing the potatoes and patting them dry. Prepare the garlic, rosemary, and other ingredients.
Place the diced potatoes in a bowl of cold water and let them soak for 20-30 minutes. Preheat your oven to 425°F towards the end of the soaking time.
Drain the potatoes and combine them with the minced garlic, olive oil, rosemary, salt, and pepper. Toss until the potatoes are evenly coated with the mixture, ensuring a good distribution of seasoning. Spread the potatoes in a single layer on a nonstick baking sheet.
Roast the potatoes in the preheated oven for about 35 minutes, stirring them halfway through to promote even browning. Serve immediately and enjoy!