How to Cook the Perfect Turkey Burger. I added 1/2 cup finely chopped red bell pepper, 10 shakes of Worcesteshire, more garlic, seasoning salt, splash of light soy, dried parsley, … Use a spoon to scrape out the gills from the underside of the mushroom cap. Mushrooms are the best way to guarantee juicy burgers… ; Once your grill is preheated, spray a large piece of tin foil with non-stick cooking spray and place the tin foil on the grill. Cut the cap into 1-inch pieces and transfer to a food processor. Delicious, but needed enhancements. These burgers are made with lean ground turkey, which means they are healthy, but it doesn’t help with keeping the burgers moist and juicy. The secret to the best turkey burgers is to add mushrooms! Add the shallot and parsley and … Then transfer the burger … We recommend cooking these turkey burgers at 375ºF on either a gas or charcoal grill as such: Start by preheating your grill to 375ºF.