Prepare the the ingredients. Preheat the griddle to medium heat for a few minutes. Add some cooking oil, the thawed tortellini, cover with a 9×13 foil pan or melting dome and squirt a little water on the griddle under the dome.
Cook 2 to 3 minutes total, flip them around halfway through, add more water, and cover again (if using the foil pan use caution as it will be hot). Set the pan or melting dome aside.
Add some more cooking oil, the onions, peppers, mushrooms, kosher salt, pepper, and steak seasoning. Cook 4 to 5 minutes, mixing together with the tortellini using hibachi spatulas.
Add the steak, garlic, and more cooking oil if needed, cook another 3 to 4 minutes, mixing it all together.
Drizzle the cream over top, plus the cheese, more kosher salt, pepper, and steak seasoning. Mix it all together for about another 2 minutes, the sauce will thicken as it cooks.