From the image description, it sounds like this person poured regular pancake batter into a casserole dish, sprinkled berries and brown sugar on top, and baked it in the oven at 400°.
The finished texture isn't mentioned, but the images make the bars look dense, firm, and less floppy than normal off-the-griddle pancakes. If so, this sounds perfect for wrapping in napkin and eating on our way to the bus stop.
If that's not the case, changing the liquid-to-dry ratio might result in a more portable pancake while maintaining the pancake-like flavor. Adding more flour, oats, or even ground nuts would make the batter more stiff, which would (theoretically) bake into a denser pancake bar.
Here are a few pancake recipes to play around with:
Has anyone ever tried pancakes like this?