OK, it happens - I didn't get exactly what I ordered in the drive thru at lunch today.  I ordered a CBO with grilled chicken and I got one with the Angus burger.  Yikes.  That is a LOT more calories (790!).  So what did I do?  No, I didn't eat the whole thing.  I went on the McDonald's app and using the customize feature of the nutrition features, I discovered that the cheese is 50 calories a slice and the bun is a big 270 calories.  So, I took off the bottom of the bun, saving about 135 calories, and I took off one piece of cheese (and my cat loved it) saving 50 calories. Then I ate 3/4 of the remaining sandwich, bringing it down to about 400 calories!  And so I also ate the small fry, making my meal 630 calories.  Not bad.

By the way, I like the Grilled Chicken CBO better.  But that's just me.

When there is a will, there really is a way.