Preheat oven:
Heat oven to 400°F (205°C). Line a baking tray with parchment paper.

Season potatoes:
Toss diced potatoes with olive oil, garlic powder, paprika, salt, and pepper.
Spread evenly on the baking tray.

Bake:
Roast for 30–35 minutes, stirring halfway, until golden and crispy.

Add feta:
Remove from the oven and immediately sprinkle crumbled feta over the hot potatoes.

Finish & serve:
Garnish with parsley and a squeeze of lemon juice if desired. Serve warm.