Preheat the Blackstone griddle to medium-high heat (375°F/190°C).
In a mixing bowl, combine olive oil, minced garlic, chili powder, ground cumin, smoked paprika, dried oregano, salt, and black pepper.
Rub the chicken breasts with the marinade mixture.
Place the marinated chicken breasts on the preheated griddle.
Cook for about 6-8 minutes per side until the internal temperature reaches 165°F (74°C).
Remove the chicken from the griddle and let it rest for a few minutes. Then, slice or chop it into bite-sized pieces.
Warm the tortillas on the griddle for about 20-30 seconds per side.
Assemble the tacos by adding the cooked chicken and your desired toppings to each tortilla.