Preheat the oven to 400°F (204°C). Line a large baking sheet with oven-safe parchment paper if desired.
Wash the potatoes thoroughly and inspect them for sprouts, eyes, green patches, and damage. Trim away minor affected areas. Discard any potatoes showing extensive greening or spoilage.
Peel the potatoes if desired. Cut each potato lengthwise, cut the sections lengthwise again, and slice across to form reasonably even small cubes.
6 Cups Potatoes
Place approximately 6 cups of cubed potatoes in a large bowl. Rinse with cold water, in colander, drain thoroughly, and pat dry with paper towels.
Add 3 tablespoons of olive oil and toss to coat. Add the remaining tablespoon only if needed to coat all the potatoes lightly.
3-4 Tbsp Olive oil
Add the Greek or Italian seasoning, onion powder, salt, and black pepper. Toss until the potatoes are evenly coated.
3 Tbsp Greek or Italian seasoning, 1 Tsp Onion powder, ¼ Tsp Black pepper, ½ Tsp Salt
Spread the potatoes across the baking sheet in a single layer, leaving space between the pieces. Sprinkle lightly with additional salt.
Roast uncovered for 20 minutes. Remove the sheet from the oven, flip or stir the potatoes, and spread them out evenly again.
Return to the oven for approximately 20 minutes, until the potatoes are fork-tender with lightly crisp, golden edges.
For deeper browning, continue roasting, checking periodically and flipping again as needed to prevent burning. Total roasting time may be 40–60 minutes or longer, depending on cube size and desired colour.
Remove the potatoes from the oven and serve hot. Cool any potatoes intended for refrigeration or freezing promptly before storing.