Heat the olive oil or butter in a large pan over medium-high heat.

If using, add the sliced onion and cook until softened, about 3-4 minutes.

If using, add the minced garlic and cook for 30 seconds until fragrant.

Add the sliced chicken to the pan. Season with salt and pepper. Cook, stirring occasionally, until the chicken is cooked through and slightly browned, about 5-7 minutes.

While the chicken cooks, warm your tortillas. You can do this in a dry pan, microwave, or oven according to package directions.

Fill each warm tortilla with the cooked chicken mixture.

If using, add optional ingredients like grated cheese (it will melt slightly on the warm chicken), avocado, cilantro, sour cream, and salsa.

Fold or roll your royal chicken tortillas and serve immediately.