
Preheat oven to 400° F. Line a baking sheet with foil.
Combine dijon mustard and 1 tablespoon olive oil in a small bowl. Brush over pork tenderloin and season with salt & pepper.
Heat 1 tablespoon olive oil in a large pan over medium-high heat. Brown the pork evenly, about 2-3 minutes per side, and transfer to the prepared baking sheet. Cook 18-20 minutes or until a thermometer reads an internal temperature of 145° F.
While pork is cooking, add butter and garlic to the same pan and cook 1 minute or until garlic is fragrant. Add chicken broth and scrape up any brown bits.
Stir in cream, mustard powder, dijon mustard, and thyme. Bring to a boil, reduce heat and simmer until thickened, about 8-10 minutes. Remove from heat.
Remove pork from the oven and rest for 5 minutes. Slice and serve with mustard sauce.