Begin the recipe by grabbing a large skillet and placing it on the stovetop on medium-high heat. Add the 1 tablespoon oil into the hot pan followed by the 1 pound thinly cut ribeye steak.
Season with ½ teaspoon salt, ¼ teaspoon ground black pepper, and ¼ teaspoon garlic powder. Cook and stir occasionally until all of the steak has browned.
Carefully use a spatula to section off each serving (about 4) for equal amounts of meat per sandwich.
Top with the 8 slices of white cheddar cheese and turn off the heat from the skillet. The residual heat will melt the cheese.
Lightly toast the 8 halves of bread and evenly spread the 2 tablespoons of horseradish sauce on the inside of each piece of bread. Top with the portioned out steak and cheese mixture.
Add the ½ cup pickled onions followed by topping with the other slice of toasted bread. Serve with a side of your favorite chips or a salad and enjoy!
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Notes
Make the pickled onions ahead of time, they only get better with age.
Toast the bread until just golden, not too hard!
Not a horseradish fan? Swap it for mayo or a creamy garlic spread.
Use a cast iron skillet for a good sear on the steak.
Prefer a different cheese? Provolone or Swiss also work great.