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["Using a potato masher, mash bread, milk, garlic powder, salt, and pepper in large bowl until smooth.", "Add beef and gently knead until well combined.", "Divide meat mixture into 4 equal portions.", "Mold each piece of meat around 1 piece of cheese.", "Transfer patties to plate and refrigerate for 30 minutes or up to 24 hours.", "Grill burgers over medium fire until well browned and cooked through, 6-8 minutes per side.", "Transfer to plate, tent with foil, and let rest 5 minutes.", "Serve.", "For Stovetop:.", "Heat 2 teaspoons vegetable oil in a large nonstick skillet over medium heat until just smoking.", "Add patties and cook until well browned, about six minutes.", "Flip burgers, cover skillet, and continue cooking until well done, about 6 minutes.", "Transfer to plate, tent with foil, and let rest 5 minutes.", "Serve.", "Cooks Note:.", "It is essential to completely seal in the cheese.", "- Using 1/2 of each portion of meat, encase the cheese to form a mini burger patty.", "- Mold remaining 1/2 portion of meat around the mini patty and seal the edges to form a ball.", "- Flatten the ball with the palm of your hand, forming a 3/4"" thick patty."]