In a small bowl, combine mayonnaise, yellow mustard, and dried dill, mixing well until smooth. Set this creamy sauce aside in the refrigerator to chill while you work on the rest of your ingredients.

Heat a large skillet over medium heat and add 1 tablespoon of butter. Once the butter has melted, toss in the sliced yellow onions along with a sprinkle of salt. Sauté the onions, stirring occasionally, for about 10-15 minutes, or until they are golden brown and caramelized. Remove them from the skillet and set aside to maintain their sweetness.

Using the same skillet, add another tablespoon of butter and let it melt over medium heat. Pour in beaten eggs, stirring gently with a spatula to scramble. Cook the eggs until they are fluffy and just set, which should take about 2-3 minutes. Once ready, transfer the scrambled eggs to a warm plate to keep them cozy while you prepare the steak.

In a bowl, mix your shaved steak with Worcestershire sauce and Montreal steak seasoning, ensuring all the pieces are coated well. In the same skillet, add the remaining tablespoon of butter and heat it over medium-high heat. Add the seasoned steak to the skillet, cooking for about 3-5 minutes until it's browned and cooked to your desired doneness.

Once the steak is browned, return the caramelized onions to the skillet, mixing them in with the steak. Divide the mixture into portions and lay slices of American cheese over the top. Cover the skillet for about a minute until the cheese melts beautifully, creating that creamy goodness essential to your Copycat McDonald’s Steak Egg And Cheese.

While the cheese melts, toast your bagel halves in a toaster or under a broiler until golden brown and crispy. Keep an eye on them to prevent burning, as bagels can toast quickly!

Spread the special sauce generously on each bagel half. Layer the bottom half with the warm scrambled eggs followed by the cheesy steak and onion mixture. Top it off with the other bagel half, pressing lightly to secure everything in place. Your Copycat McDonald’s Steak Egg And Cheese is now ready to be served hot and enjoyed!