The best way to draw a circle in gimp is still the awkward select -> foreground fill workflow. At this point this example is beating a dead horse, but the horse shall continue to be beaten until a proper ellipse tool is added.

Instructions unclear. I've kidnapped the GIMP and Inkscape teams and forced them to blend their work into one product.

It now has an ellipse tool, but finding it among the toolbars and menus is left as an exercise for the reader

I select, delete, flood fill. Three steps, but afaik it's quicker.