Savory French Onion Beef Patties with Golden Roasted Potatoes

1. Prep and Roast Potatoes

Preheat your oven: Set your oven rack to the middle position and preheat to 450 degrees Fahrenheit. Season and bake: In a rimmed baking sheet, toss the potatoes with melted butter, salt, and pepper until well-coated. Arrange the potatoes cut side down and roast until they are fork-tender with a nicely browned exterior, about 30 minutes.

2. Form and Cook Patties

Patty mixture: In a large mixing bowl, gently combine the ground beef, panko bread crumbs, and onion soup mix until well-blended. Shape patties: Form the mixture into four evenly sized patties, each about 4 inches in diameter and ½ inch thick. Sear patties: Heat 1 tablespoon of butter in a 12-inch nonstick skillet over medium-high heat. Cook the patties for around 3 minutes per side, or until they’re well-browned and reach an internal temperature of 130 degrees Fahrenheit. Transfer the patties to a platter and loosely cover with aluminum foil to keep warm.

3. Create Mushroom Gravy

Brown mushrooms: In the same skillet used for patties (do not clean), sauté the sliced mushrooms over medium-high heat until they are golden brown, which should take about 5 to 7 minutes. Thicken sauce: Sprinkle in the flour and cook for 1 minute, stirring constantly. Pour in the beef broth, increase the heat to bring the mixture to a boil, and simmer until the gravy thickens, around 1 minute. Finish gravy: Remove the skillet from the heat, and stir in the remaining 2 tablespoons of butter until the gravy is velvety and rich.