Shrimp and Veggie Quesadillas

Name: Shrimp and Veggie Quesadillas
Ingredients: 3 tbsp. salted butter, plus more as needed; 1 large yellow bell pepper, finely chopped; 1 5-ounce package baby spinach; 1 bunch scallions, chopped; 1 lb. large shrimp, peeled, deveined and cut into chunks; 1 1/2 tsp. ground cumin; 1/2 tsp. kosher salt; Black pepper, to taste; 1/2 c. salsa verde; 6 large flour tortillas; 1 8-ounce bag shredded monterey jack cheese (about 2 cups); 1 mango; Juice of 1 lime; Ancho chile powder, to taste; Sour cream and hot sauce, for serving (optional)