Preheat An Outdoor Grill For Medium-High Heat. Lightly Oil Grill Grate, And Place About 4 Inches From Heat Source. Mix The Ground Sirloin, Garlic, Onion Powder, Gorgonzola Cheese, And Basil Together In A Large Bowl Until Evenly Blended. Divide Mixture Evenly To Form Four Patties. Cook Patties On Preheated Grill Until Meat Is Evenly Browned And Center Is No Longer Pink, About 5 Minutes On Each Side.