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WARNING: you MUST have cannons unlocked to be able to use this trick!
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1. Go to the main menu and click Quick Match
2. Select Breakaway and fill up all of your skill points with cannons
This is what the set up screen should look like so far:











3. Start the game, and as soon as it starts pile every single cannon you have facing their goal as shown in the picture below











The battle should take about 10 seconds. After youve won, just press the restart button again, and watch your money grow!
TIPS:

• Buy all money upgrades to get maxium cash flow
  
• Put your cannons a few inches away from the divider line if the enemy has portals
  
• If your opponant is using cows, you can either take some UFOs and put them on either side of your cannons or just simply restart the game.

Hope you enjoyed this guide, and feel free to post in the comments if you had any problems with this technuique.