Step 4) Preheat grill to medium heat and generously oil grill grates (Note: oiling the grill grates is recommended over using grill spray in order to keep burgers from sticking). Grill burgers over Medium Direct heat for 15 to 20 minutes, turning once, until cooked through. Grilling Tip: if burgers are too soft to grill on grates, try using a grill pan. Place burgers on buns and top with desired toppings and a generous amount of Spicy Chipotle Ranch Spread.