Just imagine that rich and creamy, slightly spicy cheese added to the heat of the peppers -- all in a delicious burger!
Once the onion mixture has cooled, in a large mixing bowl, combine it with the turkey, cheese, salt, sugar, cumin and pepper. Use your hands to blend all of the ingredients together so they are evenly distributed.
Always taste jalapeños (or any chile peppers) before you use them. Depending on how much heat you want, you can use more or less of the suggested amount. They always vary -- from day to day, and pepper to pepper.