heading
Placeholder
- PlaceholderPlaceholderPlaceholderPlaceholder
About Flat Out Burgers - Beckenham
Expertly smashed, just for you. Your Flat Out journey begins at the iconic crispy edge of our patties, taking you on a tantalising trip to a juicy centre. We keep the toppings simple, delicious and customisable for you. We use quality certified British & Irish beef that's sourced carefully to halal standards - because we believe everyone should be able to enjoy our proper smashed burgers. Choose between one, two, three, four and even TEN patties - how high will you go?
Popular with other people
Single Cheeseburger
£6.90Triple Cheeseburger
£11.90Quadruple Cheeseburger
£14.90
Meal Deals 🤑
Fun, love & burgers. Oh, and your choice of sides and drinks too.
The Flat Out Combo
Currently sold out£14.50Singles Feast
Currently sold out£17.00The Flat Out Feast
Currently sold out£28.90
Seasonal Specials 🍂
Discover our two new smash burgers: expertly crafted, bold, and delicious—here for a limited time only!
Spicy Jalapeño Burger
Two juicy smash patties layered with smoky cheddar and melty American cheese, topped with a kick of chilli jam, fiery jalapeños, crispy lettuce, and our signature house burger sauce, all packed into a soft, toasted bun. Bold, spicy, and irresistibly good!£10.50BBQ Onion Burger
Two juicy smash patties layered with smoky cheddar and American cheese, with delicate, thinly sliced onions tucked between the patties for a burst of fresh flavor. Topped with crispy fried onions, BBQ sauce, our signature house sauce, and crisp lettuce—all nestled in a perfectly toasted bun.£10.50
Burgers 🍔
Burgers that are smashed for flavour and texture. How high will you go?
Single Cheeseburger
The underdog of burgers - never to be underestimated. One mighty fine crispy smashed patty with two slices of melted American cheese, diced onions, gherkins and your choice of our delicious house sauce or that classic combination of ketchup and mustard.£6.90Quadruple Cheeseburger
The Quad - for those who want it all in their burger. Four mighty fine crispy smashed patties with FIVE slices of melted American cheese, diced onions, gherkins and your choice of our delicious house sauce or that classic combination of ketchup and mustard.£14.90Triple Cheeseburger
The three-peat - only for the true burger greats. Three mighty fine crispy smashed patty with FOUR slices of melted American cheese, diced onions, gherkins and your choice of our delicious house sauce or that classic combination of ketchup and mustard.£11.90Double Cheeseburger
The champ - a truly undefeated burger. Two mighty fine crispy smashed patties with THREE slices of melted American cheese, diced onions, gherkins and your choice of our delicious house sauce or that classic combination of ketchup and mustard£8.90
THE FLAT OUT CHALLENGE 💪
A burger to end all burgers. Post a before & after shot on your Instagram story, tag @flatoutburgersuk, and you'll receive £10 off your next order. That's a pound for every patty! Do you have what it takes?
Ten Patty Cheeseburger Challenge
TEN mighty fine crispy smashed patties & ELEVEN slices of gooey American cheese* in this ultimate burger challenge. *with diced onions, gherkins and your choice of house sauce or ketchup and mustard too.£29.90
Sides 🍟
Beige but beautiful.
House Tater Tots
Currently sold out£3.90Cheeseburger Waffle Fries
Currently sold out£9.00Hot Tater Tots
Currently sold out£3.90Gooey Mac & Cheese Bites
Currently sold out£4.50House Waffle Fries
Currently sold out£3.90Hot Waffle Fries
Currently sold out£3.90Hot 'n' Gooey Mac & Cheese Bites
Currently sold out£4.50
Sauces & Dips 🍅
Dunk away.
House Sauce
Our secret house sauce. It's creamy. It's tangy. It's addictive.£0.90Cajun Ranch Sauce
House-made, smoky, creamy and blackened with cajun seasoning. A Flat Out team favourite.£0.90Ketchup
Heinz. Say no more.£0.90
Drinks 🥤
The classics only.
Rubicon Mango
Rich in vitamin C, apparently.£2.25Coke Zero
The OG minus the sugar.£2.25Coke
The OG.£2.25Fanta Orange
Fizzy orange for that juicy fix.£2.25Sprite
Fun fact: our lowest selling drink. Show it some love.£2.25
Dessert 🍦
Finish on something sweet.
Churros
Caramel-filled churros with a rich chocolate dipping sauce. A perfect, sweet finishing touch!£4.90