01 -
In a large bowl, gently combine ground beef, breadcrumbs, beaten egg, diced onion, salt, and pepper until just incorporated.
02 -
Shape the meat mixture into 6-8 oval-shaped patties. Allow them to rest while preparing the gravy base.
03 -
Heat an oven-safe skillet over medium-high heat. Brown patties for 3-4 minutes per side until golden. Remove and set aside.
04 -
Using the same skillet, sauté sliced onions in butter until translucent. Add flour and cook for 2 minutes, then gradually whisk in beef broth and heavy cream until smooth.
05 -
Return patties to the skillet, nestling them into the gravy. Cover tightly and bake at 350°F for 45 minutes, then uncover and bake for an additional 15 minutes.
06 -
Remove from oven and allow to rest for 10 minutes before serving to allow flavors to meld.