Olive Oil Banana Bread with Nutella Swirls

Before I came to the US, I had no idea what Nutella is..My sister who lives in New York always went on and on about it, and I always wondered " what it would be like "....So when I got a chance to come to US, it was one of the first things that I bought for my pantry.....And trust me, I am in love with it...Now I can go on and on about this lovely spread...It has taken over my favorite snack of br