Preheat oven to 450 degrees.
Rub mustard evenly over pork medallions. Combine panko, thyme, parsley, salt, and pepper in a large bowl. Dredge pork in panko mixture. Heat a large ovenproof skillet over medium-high heat. Add oil to pan; swirl to coat. Add pork; saute 2 minutes or until golden brown. Turn pork. Place skillet in oven; bake at 450 degrees for 8 minutes or until pork reaches 145 degrees. Let stand 3 minutes.
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