Buy OSRS Mint cake
The Mint cake is a rare food item in Old School RuneScape. When you eat it, it restores 50% of your run energy. No other item in the game restores more run energy in a single click. That makes it a great pick for players who run a lot and want to save time.
Mint cakes are hard to get in the game. They come as a rare reward from Brambickle, Wingstone, and Penwie in the Gnome Restaurant minigame. Not many players do this minigame, so very few mint cakes get traded. This is why the item costs much more than the Grand Exchange guide price suggests. A one-off mint cake can also be earned during or after The Path of Glouphrie quest by giving Longramble a tangled toad's legs, but that one does not count in the collection log.
The Mint cake weighs only 0.1 kg, so it will not slow you down. Its item ID is 9475, and it examines as "It looks very minty." If you want the best one-click run energy boost in OSRS without grinding a minigame, the Mint cake is the item to own.