1. Place oven rack in middle of oven. Preheat broiler to high. Place a baking sheet on rack in oven (keep pan in oven as it preheats).
2. Heat a large skillet over medium-high heat. Add oil to pan; swirl to coat. Add poblano and corn; cook 5 minutes, stirring once. Add quinoa, salt, and spinach; sauté 2 minutes or until spinach wilts. Remove from heat; stir in cheese.
3. Combine beans and hot sauce in a small bowl; mash with fork until smooth. Spread 2 1/2 tablespoons bean mixture on each of 4 tortillas; top each with 1/2 cup spinach mixture and 1 tortilla. Lightly coat quesadillas with cooking spray. Arrange quesadillas on preheated pan in oven; broil 3 minutes or until lightly browned, turning once.
4. Cut each quesadilla into 6 wedges. Serve with sour cream and lime.