In a large bowl combine ground beef, worcestershire sauce, sriracha, salt, pepper, garlic powder, and cilantro. Using your hands mix until well combined. Divide the meat in 4 balls, then mold each ball into a large patty - the patty should be a little larger than a slice of cheese.
Break each slice of cheese in 4 pieces, then place them in two piles with 8 pieces each. Place the stack of cheese in the center of one patty, then carefully place another patty on top of it, sealing the edges VERY tightly. I did this by just pinching them together, but make sure they're really sealed or you'll loose all your cheese while they're cooking. And that would be sad! Repeat process for second burger.
Heat butter in a large skillet over medium heat. Once hot, add the burgers and cook for 4 minutes on each side (this will give you a medium-cooked burger, adjust cooking time according to your doneness preference).
Once the burgers are cooked, carefully place them on the toasted buns, and top with an egg if using. Serve at once!
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