Coat baking sheet with olive oil or spray with cooking spray
Warm Corn tortillas on a plate in the microwave covered with a moist paper towel for 1-2 minutes.
Spoon about 1 tablespoon of diced chicken, 1 tablespoon of cheese, and 1 tablespoon of spinach long ways down the tortilla. Roll the tortilla up, starting with the straight edge. Place seam-side down on an oiled baking sheet. Repeat with remaining tortillas.
Brush the taquitos with olive oil or spray with cooking spray. Bake for 10 minutes, then turn them over and bake for until 10 minutes, or until crispy.