Scallion Pancake Quesadilla

Name: Scallion Pancake Quesadilla
Ingredients: 2 1/4 c. (270 g.) all-purpose flour, divided, plus more for dusting; 1 1/2 tsp. kosher salt, divided; 8 tbsp. vegetable oil, divided; 8 oz. white button mushrooms, rinsed, thinly sliced; 1 tsp. garlic powder; 1/4 tsp. Chinese five-spice powder; 2 tbsp. toasted sesame oil; 2 tbsp. reduced-sodium soy sauce; 2 tbsp. rice wine vinegar; 1 tbsp. chili crisp or chili oil (optional); 1 1/4 c. sliced scallions (from about 5), divided; 1 1/2 c. shredded low-moisture mozzarella