Cheesy Potato Quesadillas with Chipotle Mayo

Name: Cheesy Potato Quesadillas with Chipotle Mayo
Ingredients: 12 ounces small red potatoes (5 to 7); 1 tablespoon kosher salt, plus more as needed; 1/2 medium yellow onion; 4 medium scallions; 2 tablespoons olive oil, divided; Freshly ground black pepper; 4 (about 6-inch) flour tortillas (often labeled fajita-style), divided; 1 cup shredded Mexican cheese blend (about 4 ounces), divided; 1/2 medium lime; 1/2 cup mayonnaise; 2 tablespoons canned chipotle in adobo sauce, plus more as needed; 1/2 teaspoon kosher salt