Smashed beef burgers cooked on a Blackstone grill create a crispy outside and juicy inside in under 10 minutes. Toast the buns and grill the onions beside it for a quick dinner prep.
Preheat the Blackstone griddle to medium-high heat.
Add oil and then the onions. Cook 4-5 minutes. Flip the onions and cook for another 4 minutes. Add a splash of water and cover the onions with the dome to steam and soften.
Gently mix the salt and pepper into the beef and portion into 4 balls.
Add a splash of oil and then add a beef ball to the griddle.
Place a square of parchment paper on top of the beef ball and then smash the patty to about a 1/4 inch thick. Repeat for the rest of the beef.
Cook for 3-4 minutes, flip, and then cook for another 2 minutes. Add the buns on the side to toast.
Add the cheese to the patties, add a splash of water, and then add the dome. Cook for 30-60 seconds to melt the cheese. Remove the buns and patties to a plate to serve.
Add sauce to the bottom bun, add a cheese-covered patty or two, top with onions and the top bun, and then serve.
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Notes
For a quick burger sauce, I combine about a quarter cup of mayo with a tablespoon of ketchup and a teaspoon or two of mustard.