Assemble your quesadillas! Spread salsa onto a tortilla, and place it salsa-side up in a skillet. Sprinkle cheese, peppers and onions, and carne asada meat onto the tortilla. Then more cheese, and another tortilla.
Cook on low until it’s golden and crispy, then carefully flip it, and cook 1-2 minutes on the second side. Remove from the skillet, and allow to cool slightly before cutting.