Preheat oven to 450 degrees F. Cover a large baking sheet with parchment paper; set aside.
Add diced potatoes to a gallon-sized resealable bag (or large mixing bowl), add oil and toss to combine.
In a small bowl, combine garlic powder, salt, dried dill and pepper then pour over potatoes and toss until evenly coated. Spread potatoes in an even layer on prepared baking sheet.
Bake for 20 minutes, or until golden brown. Remove from oven and top with lemon juice and fresh dill on top; toss to coat then serve.