In a small bowl, combine the softened cream cheese, minced garlic, and Italian herbs. Blend well until smooth and creamy. Divide the mixture into four equal portions and set aside.
Seasoning and Making the Burgers
In a large bowl, mix the ground beef with the garlic powder, salt, and pepper. Ensure the seasoning is evenly distributed throughout the meat.
Divide the seasoned ground beef into eight equal portions. Roll each portion into a ball and then flatten into patties about ¼ inch thick. Remember to make the burgers slightly oversized to account for shrinkage during cooking.
Place one portion of the cream cheese mixture in the centre of four patties. Top each of these patties with the remaining four patties. Gently press the edges together to seal in the cream cheese, forming one large burger.
Grilling the Burgers
Preheat your grill to medium-high heat. Grill the burgers to your desired level of doneness, flipping once. When the burgers are almost done, place a slice of provolone cheese on each burger. Close the grill lid or cover the burgers with a lid until the cheese melts.
Making the Creamy Garlic Burger Sauce
In a saucepan, bring ¼ cup of water to a boil over medium heat. Add the minced garlic and garlic powder, boiling until the water is nearly evaporated, about 5 minutes. It is fine if a little water remains.
Stir in the heavy cream, parsley, salt, and pepper. In a small bowl, mix the cornstarch with ¼ cup of water until dissolved. Add this mixture to the cream sauce.
Continue to cook, stirring constantly, until the sauce thickens, about 3 minutes. Remove from heat; the sauce will continue to thicken as it cools.
Bringing It All Together
Place the grilled burgers on the bottoms of the brioche buns. Generously spoon the creamy garlic burger sauce over each burger. Top with the brioche bun tops and serve immediately.
