01 -
Melt unsalted butter in a medium skillet over medium heat.
02 -
Add finely diced shallot with a pinch of salt and sauté until softened, about 1 minute.
03 -
Add minced garlic and crushed black peppercorns. Cook for 30 seconds until fragrant.
04 -
Stir in Dijon mustard, Worcestershire sauce, and all-purpose flour. Cook for 1 minute to remove raw flour taste.
05 -
Slowly whisk in beef stock until smooth. Bring to a boil, then reduce heat to a simmer.
06 -
Simmer sauce uncovered for 10 minutes, then add heavy cream and simmer an additional 5 minutes until thickened. Season with salt to taste.
07 -
Let filet mignon steaks reach room temperature. Pat dry and season generously on all sides with salt and freshly cracked black pepper.
08 -
Heat a cast-iron skillet over high heat. Add avocado oil, heat until shimmering, then sear steaks 2-3 minutes per side without moving, until a golden crust forms.
09 -
Using tongs, hold each steak and sear edges for about 1 minute per edge.
10 -
Reduce heat slightly, add unsalted butter and smashed garlic to skillet. Baste steaks with melted butter for 30 seconds.
11 -
Remove steaks from skillet and allow to rest for 7 minutes before slicing.
12 -
Arrange steaks on serving plates and drizzle generously with the creamy peppercorn sauce.