Easy....... 
In fact, you don't even need to apply for Nepalese visa in US to go to Nepal if you are a US citizen. You can apply, pay for and get instant visa at Kathmandu airport once you reach at the airport immigration center.  It's ur choice whether you wanna apply over here and get visa or get the visa at airport. 

Visa nai airport ma dine bhayepachhi Ticket ko ta ke kura garai bho ra :)