Step-by-Step Instructions
The absolute secret to a perfect Swiss steak is patience. A slow, covered bake allows the braising liquid to do its magic without drying out the meat.
The Flavor Sear (Optional but Recommended)
5 mins
Preheat your oven to 325°F (165°C). While you can layer everything raw, searing the cube steaks in a hot skillet with a splash of oil for 1 minute per side creates a beautiful crust and locks in deep, caramelized flavors.
Whisk the Gravy Base
3 mins
In a medium bowl, vigorously whisk together the condensed cream of mushroom soup, full-fat sour cream, and the dry onion soup mix until the mixture is completely uniform and smooth.
Arrange your steaks in a single layer at the bottom of a greased 9x13-inch baking dish. Pour the sour cream gravy mixture completely over the top, using a spatula to ensure every single inch of the meat is fully submerged and coated.
The Low and Slow Braise
1.5 to 2 hours
Cover the baking dish tightly with a double layer of aluminum foil to lock in all the moisture. Bake at 325°F for 1.5 to 2 hours. When finished, the beef should be so tender that it easily falls apart with a fork.
Why Full-Fat Matters: Always reach for regular, full-fat sour cream when baking hot casseroles and meats. Low-fat and fat-free alternatives contain higher water content and chemical stabilizers, which will easily curdle and break into a watery mess under high oven heat.
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