Preheat the oven to 400 degrees. Line a baking sheet with parchment paper or a silicone baking mat.

Pour the tortilla chips onto the prepared baking sheet and cook for 5-6 minutes or until warm.

In a large skillet over medium heat, combine the ground beef and onion. Cook, breaking up the beef, until the beef is no longer pink, about 5 minutes. Drain off the excess fat, add the Korean BBQ Sauce, and let simmer, stirring occasionally, until the sauce thickens, about 10 minutes.

In another skillet, melt the butter over medium heat. Stir in the flour and cook for 1 minute, stirring. Whisk in the milk until smooth, then cook until it begins to thicken, about 3 minutes. Stir in the cheese and cook, stirring, until the cheese is melted.

Put the tortilla chips onto a serving platter, top with the cheese sauce then, using a slotted spoon, spoon the beef all over. Top with the chopped kimchi and cilantro and serve.