Thanks for the reply.

This allowed me to boot my system to a working KDE session:

grub> set root=(lvm/fedora/root)
grub> linuxefi (hd0,gpt2)/linuz-4.14.13-300.fc27.x86_64 root=/dev/mapper/fedora-root
grub>initrdefi (hd0,gpt2)/initramfs-4.14.13-300.fc27.x86_64.img
grub>boot

I ran "grub2-mkconfig  -o /boot/efi/EFI/fedora/grub.cfg" and it seemed to generate a valid grub.cfg file.  Do I need to do anything else to utilize that file, like a grub2-install ?   https://fedoraproject.org/wiki/GRUB_2