01 -
Preheat Blackstone grill to medium-high heat (approximately 400°F). Evenly coat the cooking surface with vegetable oil.
02 -
Place diced steak and onions in an even layer 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 onions to one side of the grill. Lower the heat to medium.
04 -
Place tortillas on the cleared area of the grill. Layer shredded mozzarella and Monterey Jack cheeses, add the cooked steak and onion mixture, then top with more cheese.
05 -
Fold each tortilla in half into a half-moon shape and cook for 1–2 minutes until the bottom is golden brown.
06 -
Flip quesadillas carefully and cook for another 1–2 minutes until the other side is golden brown, monitoring to avoid burning.
07 -
Transfer quesadillas to a cutting board, slice into wedges, and serve immediately while hot and crispy.