Adding the rows of granny stripes to mini granny squares was a little different than adding the rows granny stripes to the sunburst granny squares. Since the mini granny squares do not have a cream color border, the technique for adding the granny stripes is different. Just doing a single crochet all around for the foundation row seemed to take away from the squares, so I tried a few different things and finally found something that worked. The ch 3, ss, ch 3 was the best way to begin.
When you reach the corner of the blanket of the blanket you will need to ss, ch3, ss in the corner space. When you are done the foundation row should look something like the photo below.
After making your foundation you can begin your granny stripes, the instructions for the granny stripe rows have been added to the pattern. You can access the instructions here
Here is what the blanket looks like with ten rows of granny stripes