01 - Peel and grate the russet potatoes using a box grater. Gather the shredded potatoes in a clean kitchen towel and wring out as much moisture as possible. Transfer the dried potatoes to a mixing bowl.
02 - Add the melted butter, vegetable oil, garlic powder, onion powder, salt, and pepper to the grated potatoes. Toss until the seasoning is evenly distributed throughout the mixture.
03 - Heat a large nonstick skillet or griddle over medium-high heat. Divide the potato mixture into 4 equal portions. Press each portion into a thin patty about 4 inches in diameter. Cook for 3 to 4 minutes per side until both sides are deeply golden and crisp. Remove from the pan and keep warm.
04 - Gently shape the ground beef into 4 loose balls, being careful not to overwork the meat. Heat the skillet or griddle over high heat. Once the surface is ripping hot, place the beef balls onto the pan. Immediately smash each one flat with a heavy-duty spatula or burger press. Season the top generously with salt and pepper.
05 - Cook the smashed patties for 2 to 3 minutes until the bottom develops a dark crust and the edges turn crispy. Flip each patty, lay a slice of cheddar cheese on top, and continue cooking for 1 to 2 minutes until the cheese is fully melted. Remove from heat.
06 - Spread a generous layer of burger sauce on the bottom half of each toasted bun. Layer on a lettuce leaf, a tomato slice, and a few rings of red onion. Place a crispy hash brown patty on top, followed by the cheesy smashed burger. Add pickle slices and cap with the top bun.
07 - Serve the burgers hot while the hash browns are still crisp and the beef is juicy. Pair with crispy fries or a simple side salad if desired.