Preheat oven to 400F, with rack on upper middle position.
In a bowl, whisk together the olive oil, garlic, onion powder, salt, and pepper until well combined.
Towel-dry potatoes to remove all excess moisture. Place potatoes in single layer on a large rimmed baking sheet lined with foil. Evenly distribute the olive oil mixture over the potatoes and toss to combine well.
Bake 10 minutes, uncovered. Add broth, gently toss again, and bake another 10 minutes. Add lemon juice, toss, and bake 5-6 more minutes or just until potatoes are tender.
Serve immediately, sprinkled with fresh chives.
Notes
Cut the potatoes evenly. Keep the cubes about 1 inch so they cook at the same rate and stay tender inside.
Dry the potatoes well. Removing moisture helps them roast instead of steam, giving you crisp edges.
Use a large baking sheet. Give the potatoes plenty of space so they brown evenly and don’t crowd each other.
Toss during baking. Stirring once or twice helps the potatoes cook evenly and soak up the lemon and broth.
Add the lemon juice near the end. This keeps the flavor bright and prevents the acid from dulling during baking.
Watch the broiler closely. If you want extra color, broil for a couple of minutes at the end, but don’t walk away.
Use fresh lemon juice. Bottled juice won’t give the same clean, vibrant flavor.
Try different herbs. Chives are great, but parsley, oregano, or dill all add fresh flavor.
Reheat in the oven. Warm leftovers at 400°F for about 10 minutes to bring back the crisp texture.
Serve right away. These potatoes taste best hot from the oven when the edges are golden and the centers are soft.
If you'd like more of a browned look to the potatoes, spray the top of cooked potatoes with oil and broil them for a few minutes after baking, watching closely so they don't burn. Serve immediately.
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