01 -
Preheat the Blackstone grill to medium-high heat (approximately 400°F) and evenly coat the surface with vegetable oil.
02 -
Arrange the diced steak and diced onions evenly on the grill. Season with onion powder, salt, and black pepper. Sauté for 4-8 minutes per side until the steak is browned and cooked through.
03 -
Push the cooked steak and onion mixture to one side of the grill and lower the heat to medium on the cleared section.
04 -
Place the tortillas on the grill. Layer each tortilla with mozzarella cheese, Monterey Jack cheese, the cooked steak and onion mixture, then add more cheese on top.
05 -
Fold each tortilla in half to create a half-moon shape. Cook for 1-2 minutes until the bottom side turns golden brown.
06 -
Carefully flip each quesadilla and cook for an additional 1-2 minutes until the other side is golden brown.
07 -
Remove the quesadillas from the grill, slice into wedges, and serve immediately.