Arrange the flour tortillas on a clean work surface. Warm them briefly if needed.
Sprinkle a little cheddar and mozzarella over one half of each tortilla.
Spoon approximately 60 ml of seasoned beef mixture over the cheese. Add another small sprinkle of cheese.
Fold each tortilla in half, creating a filled taco pocket. Press gently.
Place the folded tacos in neat rows on the prepared baking sheet.
Lightly brush the tops with melted butter or olive oil.
Bake for 10–12 minutes, then flip each taco using a wide spatula.
Bake for another 5–8 minutes until both sides are golden brown.
Sprinkle a small amount of shredded cheese over the tacos during the final 2–3 minutes of baking.
Remove from the oven and sprinkle with freshly chopped cilantro.
Allow the tacos to rest for 2–3 minutes, then serve with sour cream, salsa, guacamole, or your favorite dipping sauce.