Whole Roasted Greek Chicken and Potatoes

Name: Whole Roasted Greek Chicken and Potatoes
Cook time: 45 min
Total time: 45 min
Cuisine: European, Mediterranean, Greek
Ingredients: 1.5 lbs yellow potatoes, (about 4 medium sized yellow potatoes, cut into 2" chunks); 1/2 yellow onion, (sliced thin); 2 tablespoon + 1/4 cup extra virgin olive oil; 2 1/2 teaspoon kosher salt, (divided (plus more as desired)); 1 1/4 teaspoon freshly ground black pepper, (divided); 1 1/2 tablespoons dried oregano, (divided); 1/4 cup lemon juice, (divided (about 2 lemons)); 1 [3.5-4 lb.] whole chicken