Interesting that this would come up. I just recently tried granola bars at home and I am thrilled with the result. I started with this recipe....
...and was happy with the result, AND my sons (ages 17 & 21) liked them, too! I don't need to be gluten-free, so I used regular oats. I also added in 1/4 cup of pepitas for some crunch. The consistency was a bit soft and they did fall apart a bit, but the flavor was awesome. I estimated a little over 100 cal. per bar.
SO....I thought the above recipe would be so versatile, with different fruit purees in place of pumpkin. I also wanted a crunchier/crisper texture. So I adapted that recipe and did this: I subbed banana for the pumpkin. I subbed honey for the maple syrup. I omitted all of the spices except for the cinnamon. I doubled the vanilla. I did 1/4 cup of semi-sweet mini choc chips in place of the pepitas. These came out to be 115ish calories.
For the crunchiness I wanted, I baked as stated in the recipe. After they were cool, I cut them into bars, put them on a baking rack (I used the rack I put cookies on to cool) and baked them for about 20 min longer at 350 degrees....sorta like you would a biscotti. They were perfect!! Only thing I would do differently next time would be to wrap each individually in saran or zip bag before storing them. I put them all in a Gladware container together and they softened up a bit. A friend suggested putting a piece of bread in with them to keep them crisp and I may try that, too.
One thing I did do differently is that I made both batches in a 9x13 pan.