Try this Simple Chopped Steak with Mushroom Gravy recipe
Why is the gravy breaking or failing to thicken properly? Achieving a smooth sauce relies entirely on how the flour interacts with the residual fat left in the skillet after browning the patties. Retaining precisely one tablespoon of rendered fat provides the correct lipid-to-starch ratio required to cook out the raw flour taste without burning the mixture. Pouring the beef broth in a slow, steady stream while whisking vigorously prevents starch molecules from clumping together into stubborn lumps. When steam rapidly rises from the hot pan surface, keep your face clear and maintain a constant motion with your fork.
Ground meat requires careful handling to avoid a dense, rubbery texture instead of a tender bite. Form the patties gently without compressing the ground chuck excessively, because tight packing forces out the moisture needed for juiciness. Simmering the patties uncovered in the bubbling liquid allows excess moisture to evaporate while the portobello mushrooms soften and absorb the savory reduction. Without poking the meat with a thermometer, test doneness by pressing the center of a patty; it should feel firm with clear juices rather than yielding completely to the touch.