Onion Smash Burgers

If you have made our Oklahoma Onion Burger then you are going to love this Onion Smash Burger. Being from Oklahoma, we often visit Sid’s Diner and Hamburger Inn in El Reno for the famous great depression burger. Now I can easily make this onion burger at home with simple spices.

I love using the Blackstone to cook many recipes and burgers are always a crowd favorite. The burgers cook quick, easy and with the best flavor. You may also love to try Smash Burger Sliders or Mushroom Swiss Burger Recipe.

Why We Love This Smash Burger

Anytime we have friends and family over, we make smash burgers. Everyone can add their favorite toppings and they cook so fast that makes dinnertime a breeze.

Even when we can’t cook this burger on the Blackstone, I love to cook in a large cast iron skillet for the same flavor and texture.

Ingredients

• Burger Sauce – The mayo, sour cream, Dijon Mustard, and Worcestershire Sauce with simple seasoning gives this burger the best flavor.
• Ground Beef – You can also use ground turkey or a combination of ground turkey and beef. Another option would be ground pork
• Onions – We used white onions that are finely sliced
• American Cheese – Feel free to use any cheese that you prefer
• Buns – You can use any type of hamburger buns

Scroll to the bottom for the full list of ingredients and recipe in the recipe card.

How to Make Onion Smash Burgers

Step 1 – Mix all burger sauce ingredients in a bowl. Refrigerate until ready to use.

Step 2 – Heat a Blackstone grill to medium-high heat. Divide beef into 8 equal portions (4 ounces each), loosely roll into balls.

Step 3 – Add sliced onions on top of each of the ground beef balls, season with kosher salt.

Step 4 – Immediately smash thin with a large sturdy spatula or a burger press. Cook 2-3 minutes until crispy edges form.

Step 5 – Flip burgers and place a slice of American cheese on all patties. Stack 4 of the patties on top of the other 4 patties.

Step 6 – Butter and toast burger bun on the griddle. Assemble the burgers by spreading burger sauce on both top bun and bottom buns and adding the double-stacked patties. Enjoy!

Expert Tips

• Onions – Make sure the onions are finely sliced so that they cook quickly and evenly.  
• Cooking Patties – Make sure to smash the burger balls firmly and immediately after placing them on the griddle. This will help you achieve the thin, crispy edges typical of smash burgers. Using parchment paper between the spatula and the beef can prevent sticking if needed.
• Serving Burgers – We like to serve these burger patties with the caramelized onions right off the griddle. Cooking on the large surface allows me to cook several at once.

What to Serve with Smash Burgers?

These smash burgers are delicious served with Frozen French Fries on Blackstone, Blackstone Sweet Potato Fries or Grilled Broccolini.

I like to also have all of our favorite burger toppings such as yellow mustard, lettuce, tomatoes, pickle relish, pickles, mayo, and ketchup. Everyone can add their favorite topping for the best smash burger for a delicious meal idea.

Frequently Asked Questions

Storage and Reheating Tips

• Storing – Store leftovers in an airtight container container for up to 3-4 days. We recommend storing patty separate from the bun and burger toppings to prevent the buns from getting soggy.
• Freezing – You can easily freeze the leftover smash burger patties in a freezer safe container or a zip lock bag for up to 3 months. Thaw in the fridge overnight when ready to serve.
• Reheating – Reheat the leftovers in the microwave until heated through then adding your favorite burger toppings for a quick dinner idea.