Heat oil in skillet and
add mushrooms. sauté, stirring often. Add chicken and seasonings. Blend
in pesto and stir until well combined. Remove from heat. Lay tortillas on a
flat surface and divide chicken mixture, allowing one-fourth of filling per
tortilla. Line filling down center of tortilla, folding sides toward center.
Lay each tortilla on a baking pan, seam-side down and heat in a 225 degree oven
for 5 minutes before serving. Garnish each with sour cream and chopped tomatoes.
Serves 4.