Early and often is touted as a variety that produces ears for a continuous period of time. It is also an early variety for its first ears. You're single ear may be simply due the the variety. It may also be causes by insufficient nutrients, lack of water, not enough space etc. How did you space, water, and feed your corn?

I am eating my first crop this year now - Seneca Arrowhead - a very early bicolor SE. I started it as seedlings under lights in the house. The stalks are 5 to 6 feet tall. The ears or 5" long and quite narrow. The kernels are shallow and fairly sweet but lack enough bulk to really enjoy the experience. Next year will try growing a main season variety in the house and then put it out when the ground and air temps are appropriate. White Out, Mirai 421w, and extra tender 277a are all in the ground in staggered groups now.

Lol, my apologies for the typos above.

I grew peaches and cream hybrid this year and most of my stalks only had one ear as well. I always thought one was the norm and if you got two that was just a bonus.

Here is a link that might be useful: My Garden Blog

Hate to break it to you, but one cob per stalk is the norm for most varieties. Some people think corn is not worth the effort because of this. I've had occasional plants that produce two or three cobs, but it's rare, and the extra cobs usually aren't full size.

I've heard that some rare Native American varieties may produce up to 5 ears of corn per stalk on tillers, but again i doubt all of them would be full size.

Lol, my apologies for the typos above.

I grow in raised beds with a very rich organic soil. I normally get two ears on each variety and occasionally three. Will send pics later in the season. Corn is essentially a grass and will grow taller and more ears with enough space and nutrition.