Sauté the chopped mushrooms and minced garlic in a little olive oil in a skillet until the mushrooms release their liquid and soften.
Combine the ground beef with salt and black pepper, then divide it into 8 equal portions.
Place a small amount of sautéed mushrooms and a piece of cheddar cheese in the center of one beef patty, then cover with another patty. Press the edges together to seal the filling inside.
In a hot skillet or on a grill, cook the stuffed patties for 4-5 minutes on one side, then flip and cook for another 4-5 minutes.
Cut the hamburger buns in half, spread with butter, and toast in a skillet or oven.
Spread mayonnaise and mustard on the bottom half of the bun, then place a lettuce leaf on top.
Place the stuffed patty on top, then add tomato slices and thinly sliced red onion.
Spread ketchup on the top half of the bun and place it on the burger.
Serve immediately with french fries or a light salad.
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