Put a skillet on at medium  high and eyeball enough olive oil to coat the bottom. Put the tenderloin in the skillet and sear it on all sides. Don't worry about not getting it cooked all the way thru it's going to finish with the veggies.

While the tenderloin is doing it's thing get your veggies ready. Chop up the onion and the garlic. Slice up the zucchini. Cut the tomatoes into about 1/2 inch chunks. I went with some jarred shitaki mushrooms so all I had to do was get some out of the jar.

When the tenderloin is seared to your liking slice it up into about 3/8" thick slices. And put the slices back into the skillet. Add the onion and zucchini. Then some black pepper. Shake some grated parmesan on top.

Toss or flip it altogether as it cooks. When the onion is starting to get translucent and the zucchini is starting to get singed looking add the tomatoes, garlic and mushrooms. What the hell, let's add some more grated parmesan. Toss it and flip it some more as it finishes up. As soon as the tomatoes start to look a little wimpy serve it up! Enjoy your Pork Tenderloin Skillet - and Veggies!