Okay, I looked to see if anyone else had this issue, and it seems not:
I need to bootload several 328P's and want to use the minimal configuration (https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard), so no external clock. I understand the wiring aspect and the process, but the issue I'm having is I can't even get the hardware configuration to show under my "Board:" dropdown (Step 5).
I'm running the 1.6.11 IDE and downloaded the 1-6-x.zip, extracted it, and dropped the folder into hardware. I made sure to check my preferences to make sure that I was using the correct folder (Step2), and I am.
When I restart the IDE, the "ATmega328 on a breadboard (8 MHz internal clock)" isn't available. I've cleared the folder and given it a few tries, but nothing seems to work. I've even put it in a different Arduino folder, to no avail.
Is this a known issue, or am I just missing something incredibly basic?
Thanks for any and all help.
EDIT: And I just noticed this probably should be under "Microcontrollers," so if that's an issue, can a mod move it?