Divide the beef into 4 equal portions. Gently shape each into a patty about ½ inch thick and a little wider than the buns. Press a shallow dimple into the center of each with your thumb.
Heat a grill to medium-high (about 450°F) and oil the grates, or heat a cast iron skillet over medium-high heat with a thin film of oil.
Mix the salt, pepper and garlic powder. Sprinkle over both sides of the patties right before cooking.
Cook the patties for 3–4 minutes, until well browned on the bottom. Flip and cook for 3–4 minutes more, until the centers reach 160°F.
Top each patty with a slice of cheese for the last minute of cooking. Close the grill lid or cover the skillet so it melts.
Butter the cut sides of the buns and toast them on the grill or in the skillet for about 1 minute, until golden.
Let the burgers rest for 2 minutes. Serve on the toasted buns with your favorite toppings.