So I did some searching and found this recipe on Food.com. Perfect! I omitted the red pepper flakes because the original didn't have any heat to it. The only difference between the Italian Blend I made myself and the one from Penzeys is my own contains marjoram. I'd never used marjoram before. I still couldn't tell you what marjoram tastes like, but it does seem to amp up the flavors of the other herbs in the mix.
I've found that this recipe fits nicely in my 1/2 cup jar from Penzeys. So the new mix got dumped into the old jar. I even grabbed a sharpie and wrote the following recipe on the outside: Or, for those of you who don't read chicken scratch:
2 T Marjoram
1 T garlic powder
1 T Oregano
1 T Parsley
1 T Rosemary
(1T Crushed Red Pepper Flakes)
Now, when I run out again, I won't have to flip through any recipes. It's right there! Talk about instant gratification.