Step 1

First, preheat the oven to 400ºF.

Step 2

Prepare pork tenderloin. Place spices into a small bowl and mix to combine. Then, gently pat pork tenderloin with the spice rub, covering the pork entirely.

Step 3

Heat 3 tablespoons of butter in a large cast-iron skillet over medium/high heat. When the butter is melted and fragrant, sear pork tenderloin for 2-3 minutes on each side.

Step 4

Remove pork tenderloin from cast iron and turn the heat down to low/medium. Deglaze the pan with 1.5 cups broth and use a wooden utensil to scrape the brown bits from the bottom.

Step 5

Then, add onion, garlic, mushrooms, and balsamic vinegar. Let cook for 3 minutes.

Step 6

Turn heat off, place the pork tenderloin back into the cast iron skillet, moving the veggies aside so that they’re surrounding the pork.

Step 7

Roast at 400ºF for 10 minutes. Remove from the oven, check the temperature, flip the pork tenderloin over, and bake for an additional 12-16 more minutes or until the internal temperature of the thickest part reaches 145ºF.

Step 8

Once the temperature has reached 145ºF, remove the pork tenderloin from the oven and set aside on a large plate to rest.

Step 9

Then, prepare the mushroom gravy. Add 1/2 cup (add up to 1 cup) more broth to the cast iron skillet and turn the heat to medium/high. Sprinkle in cornstarch and then continually whisk until thickened.