Heat the oven to 375 degrees.
On a rimmed sheet pan or a cast iron skillet, add one layer of tortilla chips. Top with cheese, steak, and onions. Repeat this step one to two times depending on how many layers of nachos are desired. Be sure to be generous with the cheese.
Place the nachos in the oven and bake for 15 minutes, or until the cheese is melted and slightly browned.
While the cheese melts, place the sour cream into a small bowl. Add the hot sauce and stir until incorporated. Thin out this creamy hot sauce mixture with the ranch. Set aside.
Top the nachos with cilantro and the creamy hot sauce. Serve immediately.