Cut the pork tenderloin into 1-inch thick medallions.
Season both sides with salt and pepper.
Heat olive oil in a large skillet over medium-high heat.
Sear the medallions for 2-3 minutes per side until golden brown and just cooked through. Remove from skillet and set aside.
In the same skillet, add garlic and sauté briefly until fragrant.
Stir in chicken broth, scraping up browned bits from the pan.
Reduce heat, whisk in heavy cream and Dijon mustard, and simmer until slightly thickened.
Return pork medallions to the pan, spoon sauce over them, and cook for another 2 minutes.
Garnish with fresh parsley before serving.