Sauce
1/4 c (125 ml) each butter and olive oil12 corn tortillas
1 c (250 ml) white onion, chopped
2 to 4 jalapeño peppers, ribs and seeds removed, finely diced
3 cloves of garlic, finely chopped
1/4 c unbleached all-purpose flour
2 c (500 ml) chicken stock
1 c (250 ml) sour cream
1 T (15 ml) lemon juice
1 t (5 ml) salt
Filling
8 oz (240 g) cooked boneless chicken, shredded6 oz (175 g) shredded Mexican-style cheese blend
1/2 c (125 ml) grated queso cotija cheese (or romano)
1/4 c (60 ml) chopped green onions
1/4 c (60 ml) chopped cilantro
1/4 c (60 ml) chopped parsley
Heat oil and butter in a heavy saucepan over moderate heat, add the onion and peppers, and cook about 5 minutes until soft but not browned. Add the garlic, and when fragrant, stir in the flour, and cook for 1 minute. Gradually stir in the chicken stock, and heat with stirring until the sauce boils and thickens. Off heat, stir in sour cream, lemon juice, and salt. Moisten the filling with a 1/2 c (125 ml) of the sauce, and pour half of the remainder into a greased 9x13 inch (23 x 33 cm) glass baking dish. Soften the tortillas in the microwave under a damp paper towel. Place a twelfth of the filling in a tortilla, roll up, and arrange in the baking dish, seam side down. Continue until all the tortillas are filled. Pour remaining sauce over the tortillas. Sprinkle the shredded cheese on top and bake uncovered 25 minutes at 425 degrees F (220 C) until the cheese melts and is lightly browned. Let cool 10 minutes before serving. Garnish each serving with chopped green onions if desired. Serves 4 to 6. Suggested side: slices of ripe tomato and avocado dressed in lime juice, olive oil, salt and cumin.