Slice the onion into half-moon slices and the pepper into thin strips.
Preheat the Blackstone griddle on low. Add 1-2 teaspoons of oil and the sliced onion and pepper. Season with salt and pepper. Cook for 2-3 minutes, stirring every minute.
Add the tortellini to the griddle with 1 teaspoon of oil and the water. Cook for 2-3 minutes, stirring every 30 seconds.
Increase the griddle temperature to high. Once very hot, add the shaved steak and cook for 1 minute on one side. Season with Blackstone Steakhouse seasoning, then shred the steak.
Mix all ingredients on the griddle. Add the cheese and heavy whipping cream. Cook for another 1-2 minutes until the cheese is melted.