Auto Farming

Auto Farming or AFK Farming is a term some players use to refer to the most effective way to earn Coins with the least amount of effort: pressing the Play button and let the game play itself. With the advent of New World update, coins gained this way are quite significant for very little effort (anywhere from 5000 to 9000 with an average of 7000), it is an effective method to gain Coins (and XP) without paying much attention freeing up time for the player to do other things.

Because Cookie Run is a focus intensive game, having a method to farm Coins and XP with little or no effort can be highly valuable.

Updated Method
Thanks to fellow contributors this method consistently earns 6,000 to  8,000 coins ( 7,000 on average) and is heavily reliant on the number of saves you get. Wonder Donut is the best for this job. Two Wonder Donuts makes this method a god send. Coin scale converts the many points into coins, perfect for this New World update, and Soda Cookie's ability helps gain massive amounts of points while dodging holes at the same time. Alternatively, Drenched Drink can be used.

A run would give players an average of 6,000 to  8,000 coins in every 3 to 3.5 minutes. Putting this into consideration, a nonstop play would give players a total average of 126,000 without doing anything.

Older Method
The goal of any farming runs is to obtain as much Coins and XP as possible and going AFK is no different. However the particular challenge of not jumping is taking damage from obstacles as well as falling into holes. Regardless of the cookie used, the difference in the amount of obstacles hits before the game ends differs by only a few hits. Therefore the focus should not be on how to maximize the number of hits, but rather maximize the number of coins obtained before dying. Cheesecake Cookie is the only cookie that generates sufficient coin to make such a farming run worthwhile.

The second challenge is falling into holes. Paprika Punching Bag pet solves that problem very nicely, making you giant as well as giving you extra coin. However its 15 second cool-down needs a little bit of help. That is where Heavenly Sweet Donuts or Wonder Donut shines, saving you multiple times in between the pet's cool-down as well as reviving you many times.

Because you are not jumping, the range of Angel Cookie's Holy Feather is not enough to attract the gold coins near the top of the screen when Cheesecake Cookie ability and passive activates. Also during the times where you enter into Rainbow Rush Bonus Time having more magnetic aura would give you more coins. The strongest magnetic treasure 2nd to the Holy Feather is the Cookiebox 720 Controller.

XP Variant (legacy)
With this combination, you can get 6 stages worth of XP all with only the press of the 'Play' button!