Ed Hansberry shows a quick way to hand-enter some data into Power Query from Excel:
One of the cool things about Power BI is you have a nice “Enter Data” button on the home ribbon where you can quickly add data to your model. The table isn’t dynamic, but sometimes you just need a small table to finish your model to add descriptions or some other bit of data without creating another table in a source that needs to be connected to. Enter Data is perfect for this.
It did take a little bit of trickery to accomplish, but it’s pretty easy to do.