Preheat your oven to 400°F (200°C) for crispy tortillas.
In a skillet over medium heat, brown the ground beef and chopped onion. Season with taco seasoning, salt, and pepper, cooking until the beef is fully browned and the onions are tender, about 5-7 minutes.
Lay out your tortillas on the baking sheet. Optionally fold them slightly for a taco shape.
Spoon the cooked beef mixture into each tortilla, then pour salsa over the beef and sprinkle shredded cheddar cheese on top.
Bake in the preheated oven for about 10-15 minutes until the cheese is melted and bubbly, and the tortillas are slightly crispy.
Remove from oven, cool for a minute, and serve with your favorite toppings like sour cream, guacamole, or fresh cilantro.
