Mustard & Herb Crusted Pork Tenderloin

I usually serve this pork tenderloin with garlic mashed potatoes and oven roasted vegetables (recipe below)

Ingredients:
1 pork tenderloin
2 tbsp spicy or Dijon mustard
1 tbsp regular mustard
1 tbsp honey mustard
2 tsp Herbes de Provance
2 tbsp unsalted butter
Salt & freshly cracked pepper

Directions:
Mix the mustard and Herbes de Provance in a small bowl. Rub all over the pork tenderloin.
In a large cast-iron skillet over med-high heat, add 1 tbsp of butter; as soon as it melts add the tenderloin and sear on all sides until browned.
Transfer the tenderloin to a baking sheet (lined with tin foil) and put in the oven @ 375 for 30 minutes or until juices run clear.
Let rest at least 5 minutes before serving.