Set your oven to 400°F and cover a baking sheet with foil or parchment for easy cleanup.
Brown the ground beef in a skillet along with the chopped onions, seasoning with salt and pepper to taste.
Drain any excess fat, then stir in the taco seasoning and salsa, adjusting seasoning as you like.
Lightly coat each tortilla on both sides with olive oil and arrange them on the prepared sheet.
Spoon about ¼ cup of the seasoned beef onto each tortilla, add a tablespoon of cheddar cheese if you want, then fold the tortillas in half.
Bake the tacos for 10 minutes, turn them over carefully, optionally sprinkle more cheese on top, and bake for another 5 to 10 minutes until they are crisp and golden.
