Chocolate Quesadillas

Name: Chocolate Quesadillas
Ingredients: 2 teaspoons unsweetened cocoa powder; 1/2 teaspoon chipotle chili powder; 1/4 teaspoon ground cinnamon; 1/4 teaspoon cayenne pepper; Pinch salt; 4 flour tortillas (8-inch in diameter); 2 tablespoons unsalted butter, room temperature; 4 ounces white chocolate, broken into 1-inch squares; 4 ounces dark chocolate, broken into 1-inch squares; 3 teaspoons cocoa chili powder; 4 scoops vanilla ice cream, for service; 2 tablespoons dark chocolate sauce, for garnish