Heat olive oil in a skillet over moderate heat. Season chicken thighs together with taco seasoning. Add chicken to the skillet and cook until golden, about 3-4 minutes, then put aside.
Heat tortillas according to package directions.
Working individually, put chicken, cheese, avocado, sour cream, Ranch and basil at the exact middle of each tortilla.
Bring the bottom edge of the tortilla closely over the filling, then folding at the sides. Keep on rolling before the cap of the tortilla is already reached. Repeat with remaining tortillas.
Heat a skillet over moderate heat. Insert burritos and cookpressing lightly with a spatula, about 34 minutes each side, or till golden-brown and the cheese has melted. Serve & Enjoy!