Pan Sear the steak. Season the steak liberally with salt and pepper. Add oil to a skillet over medium-high to high heat and let it get nice and hot. It should be nearly smoking hot. Lay the steak in the skillet and sear for 2 minutes, per inch of thickness per side for medium rare. When in doubt use a meat thermometer. In the last minute of cooking on the second side, add a knob (2 tablespoons) of butter and a sprig of fresh rosemary to the the pan. Once the butter is melted and bubbling, gently tip the pan and spoon butter over the top of the steak repeatedly. Remove the steak to rest on a wire rack or cutting board.
8 oz steak, salt and pepper, 2 sprigs rosemary, 4 tablespoons butter
Saute the onions. In the same pan, lower the heat to medium and add the sliced onions. Season with salt and pepper and saute until the onions soften and begin to brown. Add a dash of Worcestershire sauce and continue to cook until the onions are golden brown.
salt and pepper, 1 medium onion, 1 teaspoon Worcestershire sauce
Sauté the mushrooms. Once the onions are browned, add the sliced shiitake mushrooms and the remaining butter if necessary. Sauté the mushrooms until both sides are golden brown. Remove the onions and mushrooms from the pan and set aside.
8 large shiitake mushrooms, 4 tablespoons butter
Scramble the eggs, and cook. Beat the eggs with the sour cream until light and fluffy. Pour into the pan, and cook stirring with a spatula until they are nearly finished. They should be soft and fluffy without any noticeably runny or raw portions. Add the shredded Swiss cheese, sauteed onions, and mushroom, stir to combine. Remove them from the heat just before they are done to your liking, they will. Continue to cook off the heat.
6 large eggs, 2 tablespoons sour cream, ⅓ cup swiss cheese
Add the steak and serve hot. Once the steak is properly rested, sliced into thin pieces. Top the eggs with slices of steak, fresh parsley, and season to taste with salt and pepper. Serve as a part of a satisfying low carb high protein breakfast.